Message

structure and usage:

const messages = {
  en: {
    fileLoaded: (filename: string) => `Successfully loaded ${filename}`,
    operationComplete: (count: number, duration: string) => 
      `Processed ${count} files in ${duration}`
  },
  fr: {
    fileLoaded: (filename: string) => `Fichier ${filename} chargé avec succès`,
    operationComplete: (count: number, duration: string) => 
      `${count} fichiers traités en ${duration}`
  }
};