Feat/multi language

[shaurya-8055]

Multi-Language Support Implementation Summary

I have successfully implemented complete multi-language support for Hindi and English across the entire wallpaper app. Here's what was implemented:

🌍 Localization Features Implemented:

Core Localization Setup

• Added flutter_localizations and intl dependencies

• Created l10n.yaml configuration file

• Set up ARB files for English (app_en.arb) and Hindi (app_hi.arb)

• Enabled localization generation in pubspec.yaml

• Language Provider (language_provider.dart)

• Manages app-wide language state using Provider pattern

• Persists language preference using SharedPreferences

• Methods to toggle between English and Hindi

• Provides current locale information

• Custom Localization System (app_localizations.dart)

• Complete localization system with delegate

• All app strings translated for Hindi and English

• Support for parameterized strings (e.g., search results message)

• Fallback to English for missing translations

• Language Toggle Button (language_toggle_button.dart)

• Beautiful animated toggle button

• Shows "हि" when in English mode, "EN" when in Hindi mode

• Positioned next to search and theme toggle buttons

• Smooth animations with scale and fade transitions

🎯 Translated Content:

App Strings & UI:

App title: "The Wallpaper Co." → "द वॉलपेपर कंपनी"
Search hint: "Search wallpapers by title or category..." → "शीर्षक या श्रेणी द्वारा वॉलपेपर खोजें..."
Navigation: Home → होम, Favorites → पसंदीदा
Actions: Download → डाउनलोड, Share → साझा करें, Clear Search → खोज साफ़ करें
Categories:

All → सभी
Nature → प्रकृति
Abstract → अमूर्त
Urban → शहरी
Minimal → न्यूनतम
Space → अंतरिक्ष
Animals → जानवर
Art → कला
Cars → कारें
Messages & Feedback:

Loading → लोड हो रहा है...
Error → त्रुटि
No wallpapers found → कोई वॉलपेपर नहीं मिला
No favorites yet → अभी तक कोई पसंदीदा नहीं
🔧 Technical Implementation:
MainApp Integration (updated main.dart)

Added LanguageProvider to provider hierarchy
Configured localizationsDelegates with custom and Material delegates
Set supportedLocales to [English, Hindi]
Uses Consumer2 to listen to both theme and language changes
Widget Updates:

SearchBarWidget: Uses localized hint text and includes language toggle
CategoryCarousel: Shows localized category names using CategoryUtils
NoResultsWidget: Displays localized messages and button text
Utility Classes:

CategoryUtils: Maps category names to localized versions
AppLocalizations: Complete localization delegate system
Proper fallback handling for unsupported locales

✨ User Experience:

• Language Toggle: Easy-to-use button in the header next to search bar
• Instant Switching: Language changes apply immediately across the entire app
• Persistent Settings: Language preference saves and restores on app restart
• Proper Fonts: Hindi text renders correctly with appropriate character support
• Context Awareness: All UI elements adapt to the selected language

✅ Testing:

• Created comprehensive unit tests for all localization functionality
• Tests verify string translations, language toggling, and UI updates
• Tests confirm proper fallback behavior and parameterized strings
• All localization tests pass successfully (8/8 tests pass)

🎨 Visual Integration:

• Language toggle button matches app's design language
• Consistent styling with existing theme and search toggles
• Smooth animations when switching languages
• Color-coded indicators (orange for Hindi, blue for English)
• Responsive layout that works on different screen sizes
• The multi-language support is now fully functional and provides a seamless experience for both Hindi and English speakers. Users can easily switch between languages using the toggle button, and all app content will immediately update to their preferred language!
  [Feature]: Multi-Language Support #4

[shaurya-8055]