feat(i18n): add comprehensive Arabic localization and RTL layout support (#1039)

app/src/main/res/values/strings.xml

@@ -276,6 +276,7 @@
     <string name="settings_item_language">Language</string>
     <string name="language_system">System</string>
     <string name="language_english">English</string>
+    <string name="language_arabic">العربية</string>
     <string name="language_chinese">简体中文</string>
     <string name="language_korean">한국어</string>