Language prefix makes base url incomparable

I think the module will still have issues with subdomain languages as it just removes the www during comparison but this should fix the language prefix issue.

Thank you for the merge request.

I wonder should it instead (as well?) go through the configured list of prefixes and check each one? For example, if you have English, German and Italian configured on the site, with Italian as default, if you're on example.com/en/node/add/page and fill in a URL to example.com/de/blog/some-story it can recognize that the content path is "blog/some-story"? Some of the combinations do get a bit tricky.

This also needs tests to make sure it works as expected.