Hello Kirill, that's a nice initiative! I haven't seen/spoken Alex (sawo) for a long time either... The English language is compiled into the binary and only Alex has the source so it's difficult to change.
The only way to change it I can think of is by disassembling the executable using .NET Reflector
and editing the texts using the Reflexil
plugin for the .NET Reflector.
However, if you know a little bit about .NET Windows Forms programming you can also create a new Converter application which is also tested voor Windows Server 2008 R2 with help of the source of the disassembled converter of sawo...