* Add Persian (fa) translations
* Update index.ts
Add fa to LOCALE_LOADERS
* Update fu.ts
Add fa item
* Update index.vue
enable Persian (fa) in language selector
* Update login-form.vue
enable Persian (fa) in language selector
* Create fa.yaml
add fa backend translations
* Update i18n.go
Add fa to langFiles variable
* Add Persian (fa) Translation to agent
* feat: Implement language caching and improve language handling in i18n module
* refactor: Optimize i18n initialization with sync.Once for thread safety
* fix: Replace logging with fmt.Println for language file loading errors in i18n module
* fix: Correct format string in error logging for language file loading in i18n module
* fix: Update language files and improve error handling in i18n module
* fix: Update Malay language file extension from .yml to .yaml and add new translations in i18n module
* fix: Improve error messages for language file loading in i18n module
* fix: Ensure cached database language is set correctly during i18n initialization
* fix: Enhance language detection in i18n module by using Accept-Language header