You can use the new Unit GUID format in WoD to get the server id.
Code:
local unitType, serverID, guid = strsplit(":", UnitGUID("player"))
This may also be a great way to deliver localized messages to others in the language of the server they play on.
@TOM_RUS
How did you get the server id lists? Can one break them down into deDE, frFR and so on?