I'll write here, so as not to forget. I needed Cyrillic.
To get the national font on the Dude map you need to add it to Dude. To do this, copy to the device where you run the server Dude necessary font with the extension .ttf, in the folder dude/files. After that, this font can be selected in the settings in the client program for use.
The only inconvenience is the need to change the font in several tabs settings.
In some cases, this task can be made a little easier.
First, install in a separate folder the latest multilanguage Dude 4.0 beta3 create a new base in the desired language. Then copy the font Arial to the device where the Dude server is. After unload the base to a file and import the base file on the server Dude. All, everywhere will be font Arial.
PS The font file may be deleted when the version is updated. The operation will need to repeat