• The base locale is English ({widget}/en.js)
• Localizations for other languages are contributed by users

npm add @wbx/locales

and

import locale from "@wbx/locales/spreadsheet/en";
webix.i18n.spreadsheet = locale;

• fork the repo
• copy {widget}/en.js to {widget}/{some lang}.js
• translate all values to your language
• commit, push, make pull request