Fix text not updating when choosing back to default language, in data-i18n key method
method to detect if a key is not found in message store
Merge branch 'master' of git://github.com/wikimedia/jquery.i18n

Conflicts:
	src/jquery.i18n.js
Merge branch 'master' of git://github.com/jishnu7/jquery.i18n into jishnu7-master