Hello,
1/ It looks the Autoptimize plugin caused the mentioned issue. Once I disabled the plugin everything works fine. So try to play with settings of the plugin or contact their support.
2/ Dashboard > Settings > General > Site Language > set the desired language
3/ https://docs.woocommerce.com/document/removing-product-product-category-or-shop-from-the-urls/
4/ I’ve disabled “Static Blocks Cache” in Theme Options > Speed optimization. Clear cache and check the Footer now.
Here you can find our video tutorials – https://www.youtube.com/c/8theme/videos
Regards