chore: Translate transifex_input.json in ar

98% of minimum 50% translated 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-learning/src/i18n/messages/ar.json

@@ -32,9 +32,11 @@
   "learn.coursewareSerch.searchResultsNone": "لم يتم العثور على نتائج.",
   "learn.coursewareSerch.searchResultsLabel": "Results for \"{keyword}\":",
   "learn.coursewareSerch.searchResultsError": "حدث خطأ في عملية البحث. يرجى المحاولة مرة أخرى في بضع دقائق. إذا استمرت المشكلة، يرجى الاتصال بفريق الدعم.",
-  "learn.coursewareSerch.filter:none": "كل المحتوى",
+  "learn.coursewareSerch.filter:all": "All content",
   "learn.coursewareSerch.filter:text": "النص",
   "learn.coursewareSerch.filter:video": "فيديو",
+  "learn.coursewareSerch.filter:sequence": "Section",
+  "learn.coursewareSerch.filter:other": "Other",
   "learning.dates.badge.completed": "مُكتمل",
   "learning.dates.badge.dueNext": "الأجَل قادم",
   "learning.dates.badge.pastDue": "انقضى الأجَل",