Tak diakritika vyřešena, pomohlo:
Open file \steamapps\sourcemods\BMS\resource\ClientScheme.re s
Find section "CenterPrintText" (subsection of Fonts). Then working in this section only.
There are several options, the most appropriate -
delete the line
"custom" "1"
Poděkování: Mimokodil z http://forums.blackmesasource.com/
Výsledek v příloze.