If I click the "+" under a language flag to add a translation, the language filter will not change into the correct language(although the interface is), and it stops functioning(the interface stuck with the language), until I click the categories link from left sidebar again.
Example: I have 3 languages, English, Spanish and Swedish. I want to add translation for an English category, so I clicked the "+" under Spanish Flag of that category. The interface changes as if the Spanish filter is applied, but the language filter doesn't change accordingly. Then no matter what language I pick from the filter, it keeps in Spanish.