Category colors don’t work with WPML

I use two translation languages with WPML besides the main language.

When I customize the category color under Settings > Category Colors, it is not applied for the two translation languages. I can select a translation language in the adminbar and then change the category colors, but then the settings for the first language are gone again.

In another post here in the forum it was about the same problem. There it said that under Settings > Category Colors all translated categories are shown too. But this is not the case. I have two categories, so with translations there are six in total, but still only the two categories of the main language are displayed.

The page I need help with: [log in to see the link]