chore: Translate transifex_input.json in ar

78% of minimum 30% reviewed source file: 'transifex_input.json'
on 'ar'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/frontend-app-library-authoring/src/i18n/messages/ar.json

@@ -189,7 +189,7 @@
   "library.access.well.text": "",
   "library.access.well.button": "إضافة مستخدم جديد",
   "library.access.form.title": "",
-  "library.access.form.email.help": "",
+  "library.access.form.email.help": "أدخل عنوان البريد الإلكتروني للمستخدم المراد إضافته",
   "library.access.form.email.label": "البريد الإلكتروني",
   "library.access.form.email.placeholder": "مثال:  [email protected] ",
   "library.access.form.button.submit": "تقديم",