Hello,
1) Did you read Polylang documentation? https://polylang.pro/doc/how-to-translate-the-themes-and-plugins-hardcoded-strings/
It requires translation files and they recommend translating hardcoded strings using Loco Translate. So, please, follow the docs and translate XStore theme and XStore core plugin using Loco translate first.
2) Because it was uploaded via http but your site is https and logo is blocked https://gyazo.com/ea8b5a06bd7de3912c35017264b2ab66
I have installed Really simple SSL plugin to fix the problem. Check now.
Regards