Complete UPGRADE.md with the default user group All
Merge pull request #1506 from akeneo/fix/upgrade1.2

Complete UPGRADE.md with the default user group All
[CrowdIn] Updated translations
Merge pull request #1523 from nono-akeneo/crowdin/1.2-2014-09-11-10-53

Update translations from CrowdIn
Add default locales for javascript translations
Merge branch '1.2'

Conflicts:
	src/Pim/Bundle/InstallerBundle/Command/AssetsCommand.php