Hello,

1) The language switcher is WPML functionality Please read the following article for further help:
https://wpml.org/documentation/getting-started-guide/language-setup/language-switcher-options/

2) For the Wishlist. Please deactivate all the third party plugins and check back. If the problem continues then provide admin panel login details to check it myself and help you out accordingly.

3) You can Regenerate CSS from Woodmart >> CSS Generator.

Best Regards.