Menu item translations work the same way as content language (see: What languages are available in Locatify apps? — Content languages vs. interface (UI) languages).
Like content language, each menu item's label can be translated into any language you choose — you decide which languages to cover and add the translation in the language tab associated with that language.
Why it matters: The app interface and menu items are the first thing users see — a strong first impression. Adding translations makes it easier for users to navigate the app right from the start.