Sometimes, after translating your pages, you find out some elements on header, footer or collections are not being translated.
Please help me check your theme and make sure that you have not added or customized some own codes as the text form in theme before. If yes, those codes would be included as a Third-party element and sometimes they are not fixed completely with Shopify theme's standard.
So that's why the app cannot recognize and translate all these contents/elements on your page.
But no worries!
Definitely you could use the function "Third-party element" translation in app to translate all these elements easily.
Please be noted this feature is only available from Essential plan and Higher.
More details about this awesome feature can be found here.
Hope this would be helpful for you.
Should you need further support, please feel free to contact us via live chat or email us at firstname.lastname@example.org