menu titles on mobile device

hi, I’m new to WP and have a simple site using the ‘Path’ theme. When viewing the site on iPhone, the theme responds nicely to the narrower screen. The labels ‘Primary Menu’ and ‘Secondary Menu’ display, and jump down to the menu items. That’s fine. But I want to change the labels, so that instead of ‘Primary Menu’ it reads ‘Browse our site’ and instead of ‘Secondary Menu’ it reads ‘Practice Areas’ — you can see where this occurs viewing on the iPhone at https://sandiegocountylawoffices.com —
Can anyone tell me exactly where and how to change the menu names that appear on the mobile device? Thank you very much