Hello,
In order to translate words that are on the default site, try to use the “Loco Translate” plugin, go to Loco Translate -> Themes -> select your theme -> select language -> there click on the “Sync” button to synchronize all strings from the theme, and in the search field write “Browse Categories”, “Select Category” etc. and select it from below, create your translation and click “Save”
https://www.loom.com/share/ba09de3d5411409683bf050bd5c48f2b
https://gyazo.com/1035767efaed728a54d7ca56ef47e93c
Here is a video tutorial about Loco Translate:
https://www.youtube.com/watch?v=D3NsDdMzsls
Kind Regards