Before this commit, url_lang (= url_for) will make query to find the lang_code
but we alrady have this info in ormcache with get_available method.
So instead to rebrowse (search query) the lang, we use a new method that will
try to find it in cache if possible before to make the query.
The gain on each page is n-1 (where n is # lang installed)
Because the switcher of languages do an url_for for each lang available.
Related to #47257
task-2211013
X-original-commit: 2cecbe356ce283e15fb0bbd0a6e9aa4735af520e
Jeremy Kersten
9430dd1287