[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