No date of visit in Slovak (no replies)

Hello.

I have 2.14.2 version of Piwik and I use Slovak language.
In visitor info Piwik shows date of visit in this format "%long deň% %deň% %long mesiac% %long rok% - 20:56:20 (40 s)" ("deň" means day, "mesiac" means month, "rok" means year).
When I select Englisch language, Piwik shows date correctly "Saturday 25 July - 20:56:20 (40s)"

The same problem is also in Piwik app for android.

Thanks,
Vladky