feat(l10n): add translations for guest account and user roles

- Add Arabic and English translations for guest account and user roles
- Include new strings for "Guest Account", "Standard User", and "Premium User"
- Add corresponding descriptions for each new translation

Author: fulleni

lib/l10n/arb/app_ar.arb

@@ -1373,5 +1373,17 @@
     "headlineSearchNoResultsSubheadline": "لم نتمكن من العثور على أي عناوين تطابق بحثك. يرجى تجربة كلمات مفتاحية مختلفة.",
     "@headlineSearchNoResultsSubheadline": {
         "description": "عنوان فرعي عندما لا يُرجع بحث العناوين أي نتائج"
+    },
+    "accountGuestAccount": "حساب زائر",
+    "@accountGuestAccount": {
+        "description": "تسمية تشير إلى أن المستخدم زائر."
+    },
+    "accountRoleStandard": "مستخدم عادي",
+    "@accountRoleStandard": {
+        "description": "تسمية لدور المستخدم العادي."
+    },
+    "accountRolePremium": "مستخدم مميز",
+    "@accountRolePremium": {
+        "description": "تسمية لدور المستخدم المميز."
     }
 }

lib/l10n/arb/app_en.arb

@@ -1373,5 +1373,18 @@
     "headlineSearchNoResultsSubheadline": "We couldn't find any headlines matching your search. Please try different keywords.",
     "@headlineSearchNoResultsSubheadline": {
         "description": "Subheadline for when a headline search returns no results"
+    },
+    "accountGuestAccount": "Guest Account",
+    "@accountGuestAccount": {
+        "description": "Label indicating the user is a guest."
+    },
+    "accountRoleStandard": "Standard User",
+    "@accountRoleStandard": {
+        "description": "Label for a standard user role."
+    },
+    "accountRolePremium": "Premium User",
+    "@accountRolePremium": {
+        "description": "Label for a premium user role."
     }
+
 }