Merge branch 'stable-3.1'

Marius Burkard

2016-04-26 5152e9a75e6e0ed4dc26358e4e608ce684147b32

interface/web/admin/lib/lang/cz_login_as.lng does not exist in tree cc2fb38720de5a9dc2adffe90a9f72c09f9cac70