Hello,
1) I tried to edit the footer and don’t see the problem with the changes. For example, before – https://prnt.sc/-V8Arq1YWTCb , after https://prnt.sc/TbQPxEbMsDo7
2) Check the header now.
3) Provide us with FTP access to your site to check the issue with the section import in more detail.
4) You can edit the single product page structure in Theme Options > WooCommerce > Single product builder. To translate strings use Loco Translate.
Regards
