1) As I can see that button is already translated https://prnt.sc/11i7rup So, what is the problem with this?
2) What issues do you have with the mega menu? Could you, please, explain in more detail?
We would recommend you to create mega menu using Static Blocks https://youtu.be/f07MBdnFPfk
3) Provide us with FTP access to your site, please, to check the issue in more detail.
