diff --git a/.env.example b/.env.example
index ed764e1..62151a0 100644
--- a/.env.example
+++ b/.env.example
@@ -9,6 +9,8 @@ VITE_SUPPORT_URL=https://t.me/YourID
 VITE_OFF_SECTIONS={"appsBox": true, "logoBox": true, "timeBox": true, "usageBox": true, "userBox": true, "supportBox": true, "configs": true}
 # Apps JSON URL
 VITE_JSON_APPS_URL=https://raw.githubusercontent.com/MatinDehghanian/public-assets/refs/heads/main/json/os.json
+# Second Language Select {Options : en - ru }
+VITE_SECOND_LANG=ru
 
 ### Host Settings
 # Host URL 
diff --git a/src/components/Apps.jsx b/src/components/Apps.jsx
index 6a1b450..d973e02 100644
--- a/src/components/Apps.jsx
+++ b/src/components/Apps.jsx
@@ -224,7 +224,7 @@ const renderAppAccordion = (
       <AccordionDetails>
         <Grid container direction="column" gap={".7rem"} alignItems={"center"}>
           <Typography sx={{ paddingBottom: "1rem" }}>
-            {lang === "en" ? app.description : app.faDescription}
+            {lang === "fa" ? app.faDescription : app.description}
           </Typography>
           {app.downloadLink &&
             renderButtonGrid(
@@ -356,7 +356,7 @@ const Apps = ({ subLink }) => {
                     </Grid>
                     <Grid item xs={10} display="flex" justifyContent="center">
                       <Typography>
-                        {lang === "en" ? os.engName : os.name}
+                        {lang === "fa" ? os.name : os.engName}
                       </Typography>
                     </Grid>
                   </Grid>
diff --git a/src/components/RadioButtons.jsx b/src/components/RadioButtons.jsx
index 43707f5..4d2111f 100644
--- a/src/components/RadioButtons.jsx
+++ b/src/components/RadioButtons.jsx
@@ -34,7 +34,8 @@ const RadioButtons = ({ setIsDarkMode }) => {
   };
 
   const handleLangChange = () => {
-    const newLang = lang === "fa" ? "en" : "fa";
+    const newLang =
+      lang === "fa" ? import.meta.env.VITE_SECOND_LANG || "en" : "fa";
     i18n.changeLanguage(newLang);
     Cookies.set("language", newLang, { expires: 90 });
   };
@@ -81,10 +82,12 @@ const RadioButtons = ({ setIsDarkMode }) => {
           icon={"فارسی"}
         />
         <CapsuleButton
-          label="EN"
-          isActive={lang === "en"}
+          label={import.meta.env.VITE_SECOND_LANG || "en"}
+          isActive={lang === import.meta.env.VITE_SECOND_LANG || "en"}
           onClick={handleLangChange}
-          icon={"English"}
+          icon={
+            import.meta.env.VITE_SECOND_LANG === "ru" ? "Русский" : "English"
+          }
         />
       </Grid>
       {/* Theme Toggle */}
diff --git a/src/locales/ru/translation.json b/src/locales/ru/translation.json
new file mode 100644
index 0000000..6038ef7
--- /dev/null
+++ b/src/locales/ru/translation.json
@@ -0,0 +1,47 @@
+{
+  "remaining_volume": "Осталось траффика",
+  "initial_volume": "Весь траффик",
+  "remaining_time": "Осталось времени",
+  "initial_time": "Всего времени",
+  "megabytes": "МБ",
+  "gigabytes": "ГБ",
+  "days": "дней",
+  "welcome": "Приветствуем",
+  "Russian": "Русский",
+  "English": "English",
+  "Persian": "فارسی",
+  "status": {
+    "active": "Активно",
+    "expired": "Срок закончился",
+    "on_hold": "На удержании",
+    "disabled": "Отключена",
+    "limited": "Закончился лимит"
+  },
+  "support": "Поддержка",
+  "userPanelTitle": "Подписка пользователя {brandName}.",
+  "userPanelWelcome": "Добро пожаловать в подписку пользователя {brandName}.",
+  "operatingSystems": "Операционные системы",
+  "configuration": "Добавить в приложение",
+  "download": "Скачать",
+  "watchVideo": "Посмотреть туториал",
+  "configsList": "Список конфигов",
+  "emergancyList": "Emergancy конфиги",
+  "linkCopied": "Ссылка скопирована",
+  "expired": "Срок закончился",
+  "hours": "часов",
+  "minutes": "минут",
+  "years": "лет",
+  "copyAll": "Скопировать все",
+  "B": "Б",
+  "KB": "КБ",
+  "MB": "МБ",
+  "GB": "ГБ",
+  "TB": "ТБ",
+  "negative": "Негативно",
+  "infinity": "Бесконечно",
+  "subQRCode": "QR-код подписки",
+  "free": "Бесплатно",
+  "light": "Светлая",
+  "dark": "Темная",
+  "ended": "Закончилось"
+}
diff --git a/src/utils/Helper.js b/src/utils/Helper.js
index a54f908..f18308d 100644
--- a/src/utils/Helper.js
+++ b/src/utils/Helper.js
@@ -53,7 +53,7 @@ export const extractNameFromConfigURL = (url) => {
 
 
 export const calculateRemainingTime = (expire, t) => {
-  if (!expire) return t("unknown");
+  if (!expire) return t("infinity");
 
   let expireTimestamp;
   if (typeof expire === "number") {
diff --git a/src/utils/i18n.js b/src/utils/i18n.js
index 0c474b6..6d6b62d 100644
--- a/src/utils/i18n.js
+++ b/src/utils/i18n.js
@@ -2,6 +2,7 @@ import i18n from "i18next";
 import { initReactI18next } from "react-i18next";
 import enTranslation from "../locales/en/translation.json";
 import faTranslation from "../locales/fa/translation.json";
+import ruTranslation from "../locales/ru/translation.json";
 
 i18n.use(initReactI18next).init({
   resources: {
@@ -11,9 +12,12 @@ i18n.use(initReactI18next).init({
     fa: {
       translation: faTranslation,
     },
+    ru: {
+      translation: ruTranslation,
+    },
   },
   lng: "fa",
-  fallbackLng: "en",
+  fallbackLng: import.meta.env.VITE_SECOND_LANG || "en",
   interpolation: {
     escapeValue: false,
   },