Add a language attribute to URL entities, to allow identifying the, well, language of what the URL is pointing to.

Apart from being a nifty thing in itself, with the upcoming localisation of the entire site, it would also help to filter reviews, discography, ... sites based on the user's language/locale preferences.

Note to the whoever implements this, please keep the "hreflang" HTML attribute for the a element in mind. Also, the URL parsing for Amazon, Wikipedia, etc. could probably also hook into this (da.wikipedia -> Language: Danish, amazon.jp => Language: Japanese, etc.).