[FIX] Don't save translation if user language is English
Description
don't save language changes if the language of the user is English because we can not translate from English to English
Steps to test
please see this task : http://avan.tech/item43314--TRA-Automatic-commit-of-English-en-translation-contributed-By-to-http-i18n-tiki-org#threadId37364
Expected result
if user language is English translation won't be saved