JS Design Patterns: Adapter, see more at: https://medium.com/p/1a665e35a957

DESIGN_PATTERNS_withoutAdapterPatternExample.js

class Users {
  constructor(lang = "en") {
    this.data = [];

    this.language = lang;

    this.languageMessages = {
      add: {
        en: "Added succefully",
        fr: "Ajouté avec succès",
        pt: "Adicionado com sucesso",
      },
      remove: {
        en: "Removed succefully",
        fr: "Supprimé avec succès",
        pt: "Removido com sucesso",
      },
    };
  }

  setLanguage(lang = "en") {
    this.language = lang;
  }

  add(name) {
    this.data.push(name);
    console.log(this.languageMessages.add[this.language]);
    return true;
  }

  remove(name) {
    this.data = this.data.filter(currentName => name !== currentName);
    console.log(this.languageMessages.remove[this.language]);
    return true;
  }
}

const run = () => {
  const UsersInstance = new Users("fr");
  UsersInstance.add("Ricardo"); // will output: Ajouté avec succès

  UsersInstance.setLanguage("en");

  UsersInstance.remove("Ricardo"); // will output: Removed succefully
};

run();