Hi Natalia,
We also checked the 1. “Search products …” issue on twentyseventeen theme and we got the same issue as the issue is a WooCommerce issue. Please check out the screenshot as a reference https://prnt.sc/kirjuk In this issue, you could contact with WooCommerce Support.
Moreover, 2. “Showing all 7 results” it’s translated perfectly with our theme using Loco Translate with GTranslate WordPress plugin. Please check out the screenshot as a reference http://prntscr.com/kirkjb
Best Regards,
ThemeLooks Support Team