How to translate this menu side bar?

I’ve looking HTML location on the folder but i didn’t found the text to change (translate) this sidebar menu, it’s okay i can change it with inspect element on my browser, but to make for pemanent change i don’t know the folder or files location. (sorry for my bad english). In this case i just want to translate the sidebar menu not everything text.

Those items are translated into many languages already - if you language is missing you can contribute to the translation effort here: