Is your locale set to Polish, by chance? It looks like the Polish translation in 0.6.1 uses the wrong string format codes in a few places. It's already been fixed over on the Translations page, so it just needs to be included in the forthcoming 0.6.2 release.
Is your locale set to Polish, by chance? It looks like the Polish translation in 0.6.1 uses the wrong string format codes in a few places. It's already been fixed over on the Translations page, so it just needs to be included in the forthcoming 0.6.2 release.