The language is set when a GET variable is received like "?setlang=hr" and then stored in a cookie. Lately Google has been indexing a lot of AUR pages but with the "setlang" variable in the URL set all over the place. Google is great for searching the AUR but it's annoying to change your language settings all the time because URL google indexed has unnecessary GET variables in it.

This can be easily fixed by changing the form method from GET to POST. If you really want to keep using GET, you can include a timestamp or even better would be to detect the googlebot browser agent and then HTTP/301 them to the same URL but without the ?setlang= variable.