i18n/l20n: Amend set_lang() to provide font subset context

[bmcminn]

When setting the language of the user in Throwdown, subset context should be established when l18n is determined.

This will probably require one hell of a switch tree to set all possible subsets...

[bmcminn]

https://github.com/ilya-dev/fuzzy
This might be the best way to handle fuzzy matching partial UA lang defs against physical labels files in the i18n folder...

[bmcminn]

http://us2.php.net/manual/en/book.intl.php might be an even better approach