Don't lower()/upper() locales all the time.

[spaetz]

We will store available (=translated) locales in the form "es_CR". The function
get_locale_from_request(request) in tools/translate.py will find the best_match() best on what the webbrowser wants and what we can offer. It will return one of the AVAILABLE_LOCALES items (which we know will be of the form "lc_UP", to there is no need to invoke "locale_to_lower_upper" on every return value. Only invoke that when we parse user input (through the GET/POST parameters to normalize their input).

This is probably not costing too much, but it's one more function that is needlessly called for every request we make.

[spaetz]

this has been fixed today