Pass instances, not classes  (what a silly error)
Deleted icon set; if we really need icons later, we should consider FontAwesome, too
Updated jQuery to 1.10.2
Switched our old Bootstrap 3 snapshot with official RC 1 release
Provide messages as unicode literals, so we don't have to do the decode/encode dance
Cleaned up resources
Everything is unicode
Adapted forms to Bootstrap 3; fields cleanup, grouped them; needs further layout improvements