diff --git a/demo/trunk/node_modules/.yarn-integrity b/demo/trunk/node_modules/.yarn-integrity
index fd1f2ba2..680e8471 100644
--- a/demo/trunk/node_modules/.yarn-integrity
+++ b/demo/trunk/node_modules/.yarn-integrity
@@ -19,7 +19,7 @@
     "grunt-contrib-watch@^1.1.0",
     "grunt@^1.4.0",
     "i18next-browser-languagedetector@~8.0.0",
-    "i18next-http-backend@~2.5.0",
+    "i18next-http-backend@~2.6.0",
     "i18next@~23.14.0",
     "jquery@3.4.1"
   ],
@@ -173,7 +173,7 @@
     "http-parser-js@>=0.5.1": "https://registry.yarnpkg.com/http-parser-js/-/http-parser-js-0.5.3.tgz#01d2709c79d41698bb01d4decc5e9da4e4a033d9",
     "http2-wrapper@^2.2.1": "https://registry.yarnpkg.com/http2-wrapper/-/http2-wrapper-2.2.1.tgz#310968153dcdedb160d8b72114363ef5fce1f64a",
     "i18next-browser-languagedetector@~8.0.0": "https://registry.yarnpkg.com/i18next-browser-languagedetector/-/i18next-browser-languagedetector-8.0.0.tgz#b6fdd9b43af67c47f2c26c9ba27710a1eaf31e2f",
-    "i18next-http-backend@~2.5.0": "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.5.2.tgz#3d846cc239987fe7700d1cf0f17975807bfd25d3",
+    "i18next-http-backend@~2.6.0": "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.6.0.tgz#e2a2bc391b129c17d4918e9574962df6dc130327",
     "i18next@~23.14.0": "https://registry.yarnpkg.com/i18next/-/i18next-23.14.0.tgz#d415a858390cc849f3db0df539cb2bbfe24a3cdb",
     "iconv-lite@~0.6.3": "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.6.3.tgz#a52f80bf38da1952eb5c681790719871a1a72501",
     "ignore@^5.2.0": "https://registry.yarnpkg.com/ignore/-/ignore-5.2.4.tgz#a291c0c6178ff1b960befe47fcdec301674a6324",
diff --git a/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md b/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md
index bba09f50..5f4a23f6 100644
--- a/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md
+++ b/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md
@@ -1,3 +1,7 @@
+### 2.6.0
+
+- fix "Failed to fetch" retry case [147](https://github.com/i18next/i18next-http-backend/issues/147)
+
 ### 2.5.2
 
 - dereference timers in node.js so that the process may exit when finished [139](https://github.com/i18next/i18next-http-backend/pull/139)
diff --git a/demo/trunk/node_modules/i18next-http-backend/README.md b/demo/trunk/node_modules/i18next-http-backend/README.md
index d5e94fb0..a235c0ab 100644
--- a/demo/trunk/node_modules/i18next-http-backend/README.md
+++ b/demo/trunk/node_modules/i18next-http-backend/README.md
@@ -79,6 +79,10 @@ for plain browser:
 <!-- an example can be found in example/jquery/index.html -->
 ```
 
+```js
+i18next.use(i18nextHttpBackend).init(i18nextOptions);
+```
+
 - As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.
 - If you don't use a module loader it will be added to `window.i18nextHttpBackend`
 
@@ -152,7 +156,7 @@ for plain browser:
     mode: 'cors',
     credentials: 'same-origin',
     cache: 'default'
-  }
+  },
 
   // define a custom request function
   // can be used to support XDomainRequest in IE 8 and 9
diff --git a/demo/trunk/node_modules/i18next-http-backend/cjs/index.d.ts b/demo/trunk/node_modules/i18next-http-backend/cjs/index.d.ts
index 6d47918d..ac5620c8 100644
--- a/demo/trunk/node_modules/i18next-http-backend/cjs/index.d.ts
+++ b/demo/trunk/node_modules/i18next-http-backend/cjs/index.d.ts
@@ -103,7 +103,7 @@ export interface HttpBackendOptions {
   requestOptions?: RequestInit | ((payload: {} | string) => RequestInit);
 }
 
-type RequestCallback = (error: any, response: RequestResponse) => void;
+type RequestCallback = (error: any | undefined | null, response: RequestResponse | undefined | null) => void;
 
 interface RequestResponse {
   status: number;
diff --git a/demo/trunk/node_modules/i18next-http-backend/cjs/index.js b/demo/trunk/node_modules/i18next-http-backend/cjs/index.js
index 60767be6..08410b5a 100644
--- a/demo/trunk/node_modules/i18next-http-backend/cjs/index.js
+++ b/demo/trunk/node_modules/i18next-http-backend/cjs/index.js
@@ -6,14 +6,14 @@ Object.defineProperty(exports, "__esModule", {
 exports.default = void 0;
 var _utils = require("./utils.js");
 var _request = _interopRequireDefault(require("./request.js"));
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
 function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
 function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
 function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
-function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
+function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
+function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
+function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
 function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
 function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 var getDefaults = function getDefaults() {
@@ -109,7 +109,7 @@ var Backend = function () {
       this.options.request(this.options, url, payload, function (err, res) {
         if (res && (res.status >= 500 && res.status < 600 || !res.status)) return callback('failed loading ' + url + '; status code: ' + res.status, true);
         if (res && res.status >= 400 && res.status < 500) return callback('failed loading ' + url + '; status code: ' + res.status, false);
-        if (!res && err && err.message && err.message.indexOf('Failed to fetch') > -1) return callback('failed loading ' + url + ': ' + err.message, true);
+        if (!res && err && err.message && (err.message.indexOf('Failed to fetch') > -1 || err.message.indexOf('failed') > -1 && err.message.indexOf('fetch') > -1)) return callback('failed loading ' + url + ': ' + err.message, true);
         if (err) return callback(err, false);
         var ret, parseErr;
         try {
diff --git a/demo/trunk/node_modules/i18next-http-backend/cjs/request.js b/demo/trunk/node_modules/i18next-http-backend/cjs/request.js
index 88d30204..3515e9c2 100644
--- a/demo/trunk/node_modules/i18next-http-backend/cjs/request.js
+++ b/demo/trunk/node_modules/i18next-http-backend/cjs/request.js
@@ -10,7 +10,7 @@ function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return
 function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != _typeof(e) && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; }
 function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
 function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
 function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
 function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
diff --git a/demo/trunk/node_modules/i18next-http-backend/esm/index.d.ts b/demo/trunk/node_modules/i18next-http-backend/esm/index.d.ts
index 6d47918d..ac5620c8 100644
--- a/demo/trunk/node_modules/i18next-http-backend/esm/index.d.ts
+++ b/demo/trunk/node_modules/i18next-http-backend/esm/index.d.ts
@@ -103,7 +103,7 @@ export interface HttpBackendOptions {
   requestOptions?: RequestInit | ((payload: {} | string) => RequestInit);
 }
 
-type RequestCallback = (error: any, response: RequestResponse) => void;
+type RequestCallback = (error: any | undefined | null, response: RequestResponse | undefined | null) => void;
 
 interface RequestResponse {
   status: number;
diff --git a/demo/trunk/node_modules/i18next-http-backend/esm/index.js b/demo/trunk/node_modules/i18next-http-backend/esm/index.js
index a659ec19..0ca669fe 100644
--- a/demo/trunk/node_modules/i18next-http-backend/esm/index.js
+++ b/demo/trunk/node_modules/i18next-http-backend/esm/index.js
@@ -1,10 +1,10 @@
 function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
 function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
 function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
-function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
+function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
+function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
+function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
 function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
 function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 import { makePromise } from './utils.js';
@@ -102,7 +102,7 @@ var Backend = function () {
       this.options.request(this.options, url, payload, function (err, res) {
         if (res && (res.status >= 500 && res.status < 600 || !res.status)) return callback('failed loading ' + url + '; status code: ' + res.status, true);
         if (res && res.status >= 400 && res.status < 500) return callback('failed loading ' + url + '; status code: ' + res.status, false);
-        if (!res && err && err.message && err.message.indexOf('Failed to fetch') > -1) return callback('failed loading ' + url + ': ' + err.message, true);
+        if (!res && err && err.message && (err.message.indexOf('Failed to fetch') > -1 || err.message.indexOf('failed') > -1 && err.message.indexOf('fetch') > -1)) return callback('failed loading ' + url + ': ' + err.message, true);
         if (err) return callback(err, false);
         var ret, parseErr;
         try {
diff --git a/demo/trunk/node_modules/i18next-http-backend/esm/request.js b/demo/trunk/node_modules/i18next-http-backend/esm/request.js
index 76b986d4..3f1c7771 100644
--- a/demo/trunk/node_modules/i18next-http-backend/esm/request.js
+++ b/demo/trunk/node_modules/i18next-http-backend/esm/request.js
@@ -1,6 +1,6 @@
 function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
 function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
 function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
 function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
diff --git a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js
index f71a6a41..5abdf4ed 100644
--- a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js
+++ b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js
@@ -28,14 +28,14 @@ Object.defineProperty(exports, "__esModule", {
 exports.default = void 0;
 var _utils = require("./utils.js");
 var _request = _interopRequireDefault(require("./request.js"));
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
 function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
 function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
 function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
-function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
+function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
+function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
+function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
 function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
 function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
 var getDefaults = function getDefaults() {
@@ -131,7 +131,7 @@ var Backend = function () {
       this.options.request(this.options, url, payload, function (err, res) {
         if (res && (res.status >= 500 && res.status < 600 || !res.status)) return callback('failed loading ' + url + '; status code: ' + res.status, true);
         if (res && res.status >= 400 && res.status < 500) return callback('failed loading ' + url + '; status code: ' + res.status, false);
-        if (!res && err && err.message && err.message.indexOf('Failed to fetch') > -1) return callback('failed loading ' + url + ': ' + err.message, true);
+        if (!res && err && err.message && (err.message.indexOf('Failed to fetch') > -1 || err.message.indexOf('failed') > -1 && err.message.indexOf('fetch') > -1)) return callback('failed loading ' + url + ': ' + err.message, true);
         if (err) return callback(err, false);
         var ret, parseErr;
         try {
@@ -226,7 +226,7 @@ function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return
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diff --git a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js
index d2b6da15..8d0157e3 100644
--- a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js
+++ b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js
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t,e,n=this,o=this.services,r=o.backendConnector,i=o.languageUtils,a=o.logger,o=r.language;o&&"cimode"===o.toLowerCase()||(t=[],(e=function(e){i.toResolveHierarchy(e).forEach(function(e){t.indexOf(e)<0&&t.push(e)})})(o),this.allOptions.preload&&this.allOptions.preload.forEach(e),t.forEach(function(o){n.allOptions.ns.forEach(function(n){r.read(o,n,"read",null,null,function(e,t){e&&a.warn("loading namespace ".concat(n," for language ").concat(o," failed"),e),!e&&t&&a.log("loaded namespace ".concat(n," for language ").concat(o),t),r.loaded("".concat(o,"|").concat(n),e,t)})})}))}}])&&f(e.prototype,d),l&&f(e,l),Object.defineProperty(e,"prototype",{writable:!1});var l,d=e;d.type="backend",n.default=d;t.exports=n.default},{"./request.js":3,"./utils.js":4}],3:[function(n,o,r){!function(S){!function(){Object.defineProperty(r,"__esModule",{value:!0}),r.default=void 0;var h,b,v,m=n("./utils.js"),e=((e,t)=>{if(!t&&e&&e.__esModule)return e;if(null===e||"object"!=w(e)&&"function"!=typeof e)return{default:e};if((t=a(t))&&t.has(e))return t.get(e);var n,o,r={__proto__:null},i=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(n in e)"default"!==n&&{}.hasOwnProperty.call(e,n)&&((o=i?Object.getOwnPropertyDescriptor(e,n):null)&&(o.get||o.set)?Object.defineProperty(r,n,o):r[n]=e[n]);return r.default=e,t&&t.set(e,r),r})(n("./getFetch.js"));function a(e){var t,n;return"function"!=typeof WeakMap?null:(t=new WeakMap,n=new WeakMap,(a=function(e){return e?n:t})(e))}function t(t,e){var n,o=Object.keys(t);return Object.getOwnPropertySymbols&&(n=Object.getOwnPropertySymbols(t),e&&(n=n.filter(function(e){return Object.getOwnPropertyDescriptor(t,e).enumerable})),o.push.apply(o,n)),o}function g(o){for(var e=1;e<arguments.length;e++){var r=null!=arguments[e]?arguments[e]:{};e%2?t(Object(r),!0).forEach(function(e){var t,n;t=o,n=r[e=e],(e=(e=>(e=((e,t)=>{if("object"!=w(e)||!e)return e;var n=e[Symbol.toPrimitive];if(void 0===n)return("string"===t?String:Number)(e);if("object"!=w(n=n.call(e,t||"default")))return n;throw new TypeError("@@toPrimitive must return a primitive value.")})(e,"string"),"symbol"==w(e)?e:e+""))(e))in t?Object.defineProperty(t,e,{value:n,enumerable:!0,configurable:!0,writable:!0}):t[e]=n}):Object.getOwnPropertyDescriptors?Object.defineProperties(o,Object.getOwnPropertyDescriptors(r)):t(Object(r)).forEach(function(e){Object.defineProperty(o,e,Object.getOwnPropertyDescriptor(r,e))})}return o}function w(e){return(w="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}"function"==typeof fetch&&(h=void 0!==S&&S.fetch?S.fetch:"undefined"!=typeof window&&window.fetch?window.fetch:fetch),(0,m.hasXMLHttpRequest)()&&(void 0!==S&&S.XMLHttpRequest?b=S.XMLHttpRequest:"undefined"!=typeof window&&window.XMLHttpRequest&&(b=window.XMLHttpRequest)),"function"==typeof ActiveXObject&&(void 0!==S&&S.ActiveXObject?v=S.ActiveXObject:"undefined"!=typeof window&&window.ActiveXObject&&(v=window.ActiveXObject)),"function"!=typeof(h=h||!e||b||v?h:e.default||e)&&(h=void 0);var O=function(e,t){if(t&&"object"===w(t)){var n,o="";for(n in t)o+="&"+encodeURIComponent(n)+"="+encodeURIComponent(t[n]);if(!o)return e;e=e+(-1!==e.indexOf("?")?"&":"?")+o.slice(1)}return e},j=function(e,t,n,o){function r(t){if(!t.ok)return n(t.statusText||"Error",{status:t.status});t.text().then(function(e){n(null,{status:t.status,data:e})}).catch(n)}if(o){o=o(e,t);if(o instanceof Promise)return void o.then(r).catch(n)}("function"==typeof fetch?fetch:h)(e,t).then(r).catch(n)},P=!1;r.default=function(e,t,n,o){if("function"==typeof n&&(o=n,n=void 0),o=o||function(){},h&&0!==t.indexOf("file:")){var r=e,i=t,a=n,s=o,f=(r.queryStringParams&&(i=O(i,r.queryStringParams)),g({},"function"==typeof r.customHeaders?r.customHeaders():r.customHeaders)),u=("undefined"==typeof window&&void 0!==S&&void 0!==S.process&&S.process.versions&&S.process.versions.node&&(f["User-Agent"]="i18next-http-backend (node/".concat(S.process.version,"; ").concat(S.process.platform," ").concat(S.process.arch,")")),a&&(f["Content-Type"]="application/json"),"function"==typeof r.requestOptions?r.requestOptions(a):r.requestOptions),c=g({method:a?"POST":"GET",body:a?r.stringify(a):void 0,headers:f},P?{}:u),a="function"==typeof r.alternateFetch&&1<=r.alternateFetch.length?r.alternateFetch:void 0;try{j(i,c,s,a)}catch(e){if(!u||0===Object.keys(u).length||!e.message||e.message.indexOf("not implemented")<0)return s(e);try{Object.keys(u).forEach(function(e){delete c[e]}),j(i,c,s,a),P=!0}catch(e){s(e)}}}else if((0,m.hasXMLHttpRequest)()||"function"==typeof ActiveXObject){var f=e,r=t,u=n,l=o;u&&"object"===w(u)&&(u=O("",u).slice(1)),f.queryStringParams&&(r=O(r,f.queryStringParams));try{var d=b?new b:new v("MSXML2.XMLHTTP.3.0"),p=(d.open(u?"POST":"GET",r,1),f.crossDomain||d.setRequestHeader("X-Requested-With","XMLHttpRequest"),d.withCredentials=!!f.withCredentials,u&&d.setRequestHeader("Content-Type","application/x-www-form-urlencoded"),d.overrideMimeType&&d.overrideMimeType("application/json"),f.customHeaders);if(p="function"==typeof p?p():p)for(var y in p)d.setRequestHeader(y,p[y]);d.onreadystatechange=function(){3<d.readyState&&l(400<=d.status?d.statusText:null,{status:d.status,data:d.responseText})},d.send(u)}catch(e){console&&console.log(e)}}else o(new Error("No fetch and no xhr implementation found!"))};o.exports=r.default}.call(this)}.call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"./getFetch.js":1,"./utils.js":4}],4:[function(e,t,n){function o(e){return(o="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}Object.defineProperty(n,"__esModule",{value:!0}),n.defaults=function(n){return r.call(i.call(arguments,1),function(e){if(e)for(var t in e)void 0===n[t]&&(n[t]=e[t])}),n},n.hasXMLHttpRequest=function(){return"function"==typeof XMLHttpRequest||"object"===("undefined"==typeof XMLHttpRequest?"undefined":o(XMLHttpRequest))},n.makePromise=function(e){if((e=>e&&"function"==typeof e.then)(e))return e;return Promise.resolve(e)};var n=[],r=n.forEach,i=n.slice},{}],5:[function(e,t,n){},{}]},{},[2])(2)});
\ No newline at end of file
diff --git a/demo/trunk/node_modules/i18next-http-backend/index.d.ts b/demo/trunk/node_modules/i18next-http-backend/index.d.ts
index 6d47918d..ac5620c8 100644
--- a/demo/trunk/node_modules/i18next-http-backend/index.d.ts
+++ b/demo/trunk/node_modules/i18next-http-backend/index.d.ts
@@ -103,7 +103,7 @@ export interface HttpBackendOptions {
   requestOptions?: RequestInit | ((payload: {} | string) => RequestInit);
 }
 
-type RequestCallback = (error: any, response: RequestResponse) => void;
+type RequestCallback = (error: any | undefined | null, response: RequestResponse | undefined | null) => void;
 
 interface RequestResponse {
   status: number;
diff --git a/demo/trunk/node_modules/i18next-http-backend/lib/index.js b/demo/trunk/node_modules/i18next-http-backend/lib/index.js
index d1870100..b6494944 100644
--- a/demo/trunk/node_modules/i18next-http-backend/lib/index.js
+++ b/demo/trunk/node_modules/i18next-http-backend/lib/index.js
@@ -74,7 +74,7 @@ class Backend {
     this.options.request(this.options, url, payload, (err, res) => {
       if (res && ((res.status >= 500 && res.status < 600) || !res.status)) return callback('failed loading ' + url + '; status code: ' + res.status, true /* retry */)
       if (res && res.status >= 400 && res.status < 500) return callback('failed loading ' + url + '; status code: ' + res.status, false /* no retry */)
-      if (!res && err && err.message && err.message.indexOf('Failed to fetch') > -1) return callback('failed loading ' + url + ': ' + err.message, true /* retry */)
+      if (!res && err && err.message && (err.message.indexOf('Failed to fetch') > -1 || (err.message.indexOf('failed') > -1 && err.message.indexOf('fetch') > -1))) return callback('failed loading ' + url + ': ' + err.message, true /* retry */)
       if (err) return callback(err, false)
 
       let ret, parseErr
diff --git a/demo/trunk/node_modules/i18next-http-backend/package.json b/demo/trunk/node_modules/i18next-http-backend/package.json
index 3b734cd5..3dbffa2b 100644
--- a/demo/trunk/node_modules/i18next-http-backend/package.json
+++ b/demo/trunk/node_modules/i18next-http-backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "i18next-http-backend",
-  "version": "2.5.2",
+  "version": "2.6.0",
   "private": false,
   "type": "module",
   "main": "./cjs/index.js",
@@ -31,9 +31,9 @@
   },
   "types": "./index.d.mts",
   "devDependencies": {
-    "@babel/cli": "7.24.5",
-    "@babel/core": "7.24.5",
-    "@babel/preset-env": "7.24.5",
+    "@babel/cli": "7.24.8",
+    "@babel/core": "7.25.2",
+    "@babel/preset-env": "7.25.3",
     "babel-plugin-add-module-exports": "1.0.4",
     "browserify": "17.0.0",
     "dtslint": "4.2.1",
@@ -45,14 +45,14 @@
     "eslint-plugin-require-path-exists": "1.1.9",
     "eslint-plugin-standard": "5.0.0",
     "expect.js": "0.3.1",
-    "i18next": "23.11.4",
+    "i18next": "23.14.0",
     "json-server": "0.17.4",
     "json5": "2.2.3",
-    "mocha": "10.4.0",
+    "mocha": "10.7.3",
     "tslint": "5.20.1",
-    "tsd": "0.31.0",
-    "typescript": "5.4.5",
-    "uglify-js": "3.17.4",
+    "tsd": "0.31.1",
+    "typescript": "5.5.4",
+    "uglify-js": "3.19.2",
     "xmlhttprequest": "1.8.0"
   },
   "description": "i18next-http-backend is a backend layer for i18next using in Node.js, in the browser and for Deno.",
diff --git a/demo/trunk/package.json b/demo/trunk/package.json
index b9deb61d..7986eeb1 100644
--- a/demo/trunk/package.json
+++ b/demo/trunk/package.json
@@ -18,7 +18,7 @@
     "dwv": "0.33.1",
     "i18next": "~23.14.0",
     "i18next-browser-languagedetector": "~8.0.0",
-    "i18next-http-backend": "~2.5.0",
+    "i18next-http-backend": "~2.6.0",
     "jquery": "3.4.1"
   },
   "devDependencies": {
diff --git a/demo/trunk/yarn.lock b/demo/trunk/yarn.lock
index 073992d7..571dc4a6 100644
--- a/demo/trunk/yarn.lock
+++ b/demo/trunk/yarn.lock
@@ -981,10 +981,10 @@ i18next-browser-languagedetector@~8.0.0:
   dependencies:
     "@babel/runtime" "^7.23.2"
 
-i18next-http-backend@~2.5.0:
-  version "2.5.2"
-  resolved "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.5.2.tgz#3d846cc239987fe7700d1cf0f17975807bfd25d3"
-  integrity sha512-+K8HbDfrvc1/2X8jpb7RLhI9ZxBDpx3xogYkQwGKlWAUXLSEGXzgdt3EcUjLlBCdMwdQY+K+EUF6oh8oB6rwHw==
+i18next-http-backend@~2.6.0:
+  version "2.6.0"
+  resolved "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.6.0.tgz#e2a2bc391b129c17d4918e9574962df6dc130327"
+  integrity sha512-WX5pXYNrAz2fj8ajsAuCIsogOEvJL+aHw4RTQAD/uqPoLV1FHqa6IsUULTfa3GtREVQbApp0U3woLhz9EuR2pQ==
   dependencies:
     cross-fetch "4.0.0"