Pontoon: Update Arabic (ar) localization of TW Power Tools

Co-authored-by: Medelinor <eloueryaghlymohamed@gmail.com>
diff --git a/src/static/_locales/ar/messages.json b/src/static/_locales/ar/messages.json
index d635579..1612dbc 100644
--- a/src/static/_locales/ar/messages.json
+++ b/src/static/_locales/ar/messages.json
@@ -585,6 +585,14 @@
     "message": "رائج",
     "description": "Label used in a thread to show it has been manually marked as trending."
   },
+  "inject_threadpagedesign_warning": {
+    "message": "قد لا يعمل هذا الملصق بشكل صحيح. هذا لأنه يستخدم ميزة الردود المتداخلة، وقمتَِ بتمكين تصميم مؤشر الترابط القديم في خيارات TW Power Tools، والتي لا تدعم الردود المتداخلة.",
+    "description": "Message showed above threads which might not work properly because of the fact that the old thread design is not compatible with nested replies."
+  },
+  "btn_learnmore": {
+    "message": "قراءة المزيد",
+    "description": "Text shown besides a warning message which the user can click to learn more about the message itself."
+  },
   "actionbadge_permissions_requested": {
     "message": "تحتاج بعض الميزات إلى أذونات إضافية للعمل. يلزم النّقر لإصلاحها.",
     "description": "Tooltip for the extension icon when a feature is enabled but it needs several permissions to be granted."