Removed hack that ensure mojits/requests translations don't interfere. Now the closest available language is determined, resorting to a default lang or the root lang; if no language is set, then no translation is done, this prevent the active language from being used, thereby eliminating mojits/reqeusts interference.
Update history.
Mocking Y.Intl.lookupBestLang.
Merged develop.
Merge pull request #1377 from yahoo/intl-addon-fix

Intl Addon Fix