How to increase displayed map name length in TA?

When adding maps to Team Arena (missionpack) with a long name than the displayed name is limited to 25 characters, any following character is missing. You can see this if you add this map to your Team Arena collection: The map is called: “Let’s Drink Beer and Shoot Things”, in the Team Arena start server menu only “Let’s Drink Beer and Shoot” is displayed.
I had a quick look at the source code, there is MAX_MAPNAMELENGTH defined in code\ui\ui_local.h, but this definition seems obsolet/unused.

Is there any chance to fix this?

Thanks in advance!