Same as Megamek 0.41.19, in 0.41.20 Princess greets me in Russian when the client language is set to English, other than that it's not bad, didn't playtest it too much though. Could it be because of my Russian Windows system?
UPD: A little bit of clarity: I've tested several builds right now, I just like to know why do some things happen, latest stable megamek (0.40.1) has the same issue. Earlier versions do not.
This has something to do with Russian translation (I've done a part of it) - the changelog for 0.40.0 is as follows:
Bug: build.xml not up to date with l10n -> i18n change
In that i18n folder, its client/bot subfolder contains messages.properties file - these are English bot messages and messages_ru properties - these are Russian. There are more language specific files, perhaps. Probably, the language file should depend on client language settings.