Thanks for flagging this up. We'll look into it and try to resolve it.
It seems like there might be something amiss character encoding wise?
For example, taking a look at this route: https://www.plotaroute.com/route/635703
It should be named "Letiště Ladná → Bernhardsthaler Teichstüberl" and that's what the smaller text inside the map's black frame says. The big title however reads "LetiÅ¡tÄ› LadnÃ¡ â†’ Bernhardsthaler TeichstÃ¼berl" which is a bit harder to recognise. ☺