Improve post upgrade scripts.

git-svn-id: svn://svn.code.sf.net/p/openmediavault/code@1429 3c3d7b80-5828-415e-9f61-280b98178fff
Update locales.

git-svn-id: svn://svn.code.sf.net/p/openmediavault/code@1430 3c3d7b80-5828-415e-9f61-280b98178fff