l10n(ar): update Arabic localization

Currently translated at 100.0% (146 of 146 strings)

Change-Id: I8599f0705f6a4774d7b87075fff095df4489bc88
Co-authored-by: MOHAMED EL OUERYAGHLY <eloueryaghlymohamed@gmail.com>
Translate-URL: https://i18n.avm99963.com/projects/tw-power-tools/extension-strings-json-format/ar/
Translation: TW Power Tools/Extension strings (JSON format)
diff --git a/src/static/_locales/ar/messages.json b/src/static/_locales/ar/messages.json
index f06ba2d..2c84a8f 100644
--- a/src/static/_locales/ar/messages.json
+++ b/src/static/_locales/ar/messages.json
@@ -608,5 +608,9 @@
     "actionbadge_killswitch_enabled": {
         "message": "تم تعطيل بعض الميزات قسرا. النّقر للحصول على مزيد من المعلومات.",
         "description": "Tooltip for the extension icon shown when a kill switch has been enabled."
+    },
+    "inject_perforumstats_chart_communityguides": {
+        "message": "أدلّة المنتدى",
+        "description": "Label shown in the legend of the per-forum activity chart."
     }
 }