chore(l10n): update app authentication page translations

- Update headline and subheadline translations for multiple languages
- Replace "Headlines Toolkit" with "Veritas" as the new app name
- Adjust subheadline to emphasize trusted, unfiltered news from around the world

Author: fulleni

lib/l10n/app_localizations.dart

@@ -455,13 +455,13 @@ abstract class AppLocalizations {
   /// Headline for the authentication page during standard sign-in
   ///
   /// In en, this message translates to:
-  /// **'Headlines Toolkit'**
+  /// **'Veritas'**
   String get authenticationSignInHeadline;
 
   /// Subheadline for the authentication page during standard sign-in
   ///
   /// In en, this message translates to:
-  /// **'Develop News Headlines Apps Rapidly & Reliably.'**
+  /// **'Unfiltered news from trusted sources around the world.'**
   String get authenticationSignInSubheadline;
 
   /// AppBar title for the email sign-in page

lib/l10n/app_localizations_ar.dart

@@ -194,11 +194,11 @@ class AppLocalizationsAr extends AppLocalizations {
       'إحفظ إعداداتك، تفضيلات المحتوى والمزيد عبر مختلف الأجهزة.';
 
   @override
-  String get authenticationSignInHeadline => 'هادلاينز تولكيت';
+  String get authenticationSignInHeadline => 'فيريتاس';
 
   @override
   String get authenticationSignInSubheadline =>
-      'طور التطبيقات الإخبارية بسرعة وبشكل موثوق.';
+      'أخبار غير مصفاة من مصادر موثوقة حول العالم.';
 
   @override
   String get emailSignInPageTitle => 'تسجيل الدخول بالبريد الإلكتروني';

lib/l10n/app_localizations_en.dart

@@ -196,11 +196,11 @@ class AppLocalizationsEn extends AppLocalizations {
       'save your settings, content preferences and more across devices.';
 
   @override
-  String get authenticationSignInHeadline => 'Headlines Toolkit';
+  String get authenticationSignInHeadline => 'Veritas';
 
   @override
   String get authenticationSignInSubheadline =>
-      'Develop News Headlines Apps Rapidly & Reliably.';
+      'Unfiltered news from trusted sources around the world.';
 
   @override
   String get emailSignInPageTitle => 'Sign in with Email';

lib/l10n/arb/app_ar.arb

@@ -242,11 +242,11 @@
     "@authenticationLinkingSubheadline": {
         "description": "عنوان فرعي يشرح فائدة ربط حساب مجهول"
     },
-    "authenticationSignInHeadline": "هادلاينز تولكيت",
+    "authenticationSignInHeadline": "فيريتاس",
     "@authenticationSignInHeadline": {
         "description": "عنوان صفحة المصادقة أثناء تسجيل الدخول القياسي"
     },
-    "authenticationSignInSubheadline": "طور التطبيقات الإخبارية بسرعة وبشكل موثوق.",
+    "authenticationSignInSubheadline": "أخبار غير مصفاة من مصادر موثوقة حول العالم.",
     "@authenticationSignInSubheadline": {
         "description": "عنوان فرعي لصفحة المصادقة أثناء تسجيل الدخول القياسي"
     },

lib/l10n/arb/app_en.arb

@@ -242,11 +242,11 @@
     "@authenticationLinkingSubheadline": {
         "description": "Subheadline explaining the benefit of linking an anonymous account"
     },
-    "authenticationSignInHeadline": "Headlines Toolkit",
+    "authenticationSignInHeadline": "Veritas",
     "@authenticationSignInHeadline": {
         "description": "Headline for the authentication page during standard sign-in"
     },
-    "authenticationSignInSubheadline": "Develop News Headlines Apps Rapidly & Reliably.",
+    "authenticationSignInSubheadline": "Unfiltered news from trusted sources around the world.",
     "@authenticationSignInSubheadline": {
         "description": "Subheadline for the authentication page during standard sign-in"
     },