Of course it can be removed, that's why I paid software. No term which obliges me to have your signature there, nor is there any mention from you indicating that your signature must be present. Being what they are doing is illegal, using others properties to promote your software that was paid. It is also illegal because they are not giving any alternative for removal. The term "visit https://gtranslate.io
" is not a signature is a promotion at your site and to your software.
I expect a brief answer.