You can translate theme string with the POT File. Translate it and Upload to Your Theme Folder
You can be found POT file on theme folder > language folder, you’ll need to open it in a program like POEdit, and translate the English language into your preferred language. When complete, you’ll want to save the file twice, as two separate files – a .po file and a .mo file. When you save the files, you must name them according to your language code.
Find a list of language codes at WordPress in your Language. As an example, the language code for English is en_EN, so you would save the translated files as en_EN.po first, then en_EN.mo. When that’s done, simply upload the files to your theme folder>language folder.