export declare class TranslationService {
    private readonly translations;
    constructor();
    private loadTranslations;
    translate(key: string, lang: string, params?: Record<string, string>): string;
    isValidLanguage(lang: string): boolean;
    getSupportedLanguages(): string[];
    translateMultiple(keys: string[], lang: string): Record<string, string>;
    getAllTranslations(lang: string): Record<string, string>;
}