Set the current language
Get the current language
Get translated text with variable substitution
Check if a translation key exists
Get all available languages
Add a translation key to the current language
Remove a translation key
Get all translation keys for the current language
Validate a language pack structure
Get localization statistics
Create a contextual translation helper
Format numbers according to locale (basic implementation)
Format dates according to locale (basic implementation)
Optionaloptions: DateTimeFormatOptionsGet pluralization rules for current language (simplified)
Clear all loaded language packs (except default)
Load a language pack