chore: Translate transifex_input.json in ar

86% 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

@@ -97,7 +97,7 @@
   "library.edit.description.help": "وصف مكتبتك",
   "library.edit.type.label": "نوع المكتبة *",
   "library.edit.type.help": "نوع المكتبة.",
-  "library.edit.type.label.video": "",
+  "library.edit.type.label.video": "الفيديو (beta)",
   "library.edit.type.label.problem": "",
   "library.edit.type.label.complex": "",
   "library.edit.public_learning.label": "إتاحة المحتوى التعليمي للجميع",