refactor(app_configuration): rename "general" to "system" in app configuration

- Update tab title from "appTab" to "systemTab"
- Modify Arabic and English localization files to reflect the change
- Correct typo in "feedItemClickBehaviorDescription"

Author: fulleni

lib/app_configuration/view/app_configuration_page.dart

@@ -65,7 +65,7 @@ class _AppConfigurationPageState extends State<AppConfigurationPage>
           tabAlignment: TabAlignment.start,
           isScrollable: true,
           tabs: [
-            Tab(text: l10n.appTab),
+            Tab(text: l10n.systemTab),
             Tab(text: l10n.featuresTab),
             Tab(text: l10n.userTab),
           ],

lib/l10n/app_localizations_ar.dart

@@ -115,7 +115,7 @@ class AppLocalizationsAr extends AppLocalizations {
   String get advertisementsTab => 'الإعلانات';
 
   @override
-  String get generalTab => 'عام';
+  String get systemTab => 'النظام';
 
   @override
   String get userContentLimitsTitle => 'حدود المحتوى';

lib/l10n/arb/app_ar.arb

@@ -139,9 +139,9 @@
   "@advertisementsTab": {
     "description": "عنوان تبويب إعدادات الإعلانات"
   },
-  "generalTab": "عام",
-  "@generalTab": {
-    "description": "عنوان تبويب الإعدادات العامة"
+  "systemTab": "النظام",
+  "@systemTab": {
+    "description": "عنوان تبويب لإعدادات النظام"
   },
   "userContentLimitsTitle": "حدود المحتوى",
   "@userContentLimitsTitle": {
@@ -2071,7 +2071,7 @@
     "description": "عنوان إعداد سلوك النقر على عنصر الموجز."
   },
   "feedItemClickBehaviorDescription": "اختر المتصفح الذي يفتح عند نقر المستخدم على عنوان في الموجز.",
-  "@feedItemClickbehaviorDescription": {
+  "@feedItemClickBehaviorDescription": {
     "description": "وصف إعداد سلوك النقر على عنصر الموجز."
   },
   "feedItemClickBehaviorInternalNavigation": "متصفح داخل التطبيق",

lib/l10n/arb/app_en.arb

@@ -139,9 +139,9 @@
   "@advertisementsTab": {
     "description": "Tab title for Advertisements settings"
   },
-  "generalTab": "General",
-  "@generalTab": {
-    "description": "Tab title for General settings"
+  "systemTab": "System",
+  "@systemTab": {
+    "description": "Tab title for system settings"
   },
   "userContentLimitsTitle": "User Content Limits",
   "@userContentLimitsTitle": {
@@ -2067,7 +2067,7 @@
     "description": "Title for the feed item click behavior setting."
   },
   "feedItemClickBehaviorDescription": "Select which browser opens when a user taps on a headline in the feed.",
-  "@feedItemClickbehaviorDescription": {
+  "@feedItemClickBehaviorDescription": {
     "description": "Description for the feed item click behavior setting."
   },
   "feedItemClickBehaviorInternalNavigation": "In-App Browser",