chore: Translate transifex_input.json in ar

97% 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-component-footer/src/i18n/messages/ar.json

@@ -23,7 +23,7 @@
   "footer.connectLinks.contact": "اتصل بنا",
   "footer.connectLinks.help": "مركز المساعدة",
   "footer.connectLinks.mediaKit": "الحقيبة الإعلامية",
-  "footer.connectLinks.donate": "Donate",
+  "footer.connectLinks.donate": "تبرَّع",
   "footer.mobileApp.apple": "تحميل تطبيق edX للهواتف الجوالة من متجر Apple",
   "footer.mobileApp.google": "تحميل تطبيق edX للهواتف الجوالة من Google Play",
   "footer.logo.altText": "شعار edX",