Hello

I am using ZenCart 1.3.8a with Ultimate SEO URLs version 2.101.
I would like to separate language mutations into unique URLs which would have a /cz/ and /en/ virtual folder.

I have found out that googlebot indexes only default language mutation (cz) and is not indexing pages in secondary language (english in my case). The only way to achieve multilingual indexing is (AFAIK) to provide unique URL for each language variant such as:

https://www.silverbull.cz/cz/about_us.html
or
https://www.silverbull.cz/en/about_us.html

Storing language variant only in $_SESSION['languages_id'] won't help googlebot index secondary language. Default CZ is always selected when bot visits the site - that is what happens now. Both language mutations are accessed by https://www.silverbull.cz/about_us.html (?language=en|cz parameter appears only once the language is switched)

So, what is the easiest way to get multilingual unique URLs? I think this issue could be solved by altering .htaccess file and entering correct rewrite rule hat would catch language=$1 parameter at the end of each URL and place it right after the domain name and slash. But I'm utterly weak at regexps and I have no idea how to do it - tried something like this:

RewriteRule ^(.*)en/about_us.html$ index.php?main_page=about_us&language=en [L]

Does not work and needs parametrisation.
Second way could be altering seo.url.php file so that each URL is prefixed with /cz/ or /en/ string depending on $_SESSION['languages_id'].

Thanks for any advices/directions