I think that looks more like this bug report.
It also affect Slovenian, but if you chose different icon set then default, it may also look like this
As Luke pointed out in the beginning of this post it could be down to translators accidentally translating icon IDs.
I delete all those strings. But I don't know how to download those strings for my language all at once and check if that fix the problem. So if anyone can tell me how, I can try this and report back.