bug fix in find_user_from_username method
bug fix when subscribing users to an instance via a file upload
fixed bug in case of user asked to change the password (no more redirect to home page as logged user) + some small fixes
fixed a bug in array og languages
modified email/username validator in order to accept case insensitive email
fixed bug in translation when input is empty string
fixed subscription to needed provider when switcher uploads a subscription file
Merge branch 'origin/master'
fix in language selection when redirecting from confirm to user home page
Merge branch 'upstream/master'
Merge branch 'master'