When you install Bartik and minimize your browser to mobile display you can see the caption "Show - Main navigaton":
I want to translate it to Hebrew so I went to
admin/config/regional/translate and typed the stream to change it but found nothing so I guess it's hardcoded somewhere.
Yet, I searched in page.html.twig and menu-block twig but didn't find this stream. I also didn't find CSS language-construct (as in
You might know where this stream is located or at least answer with a good way to search it?