Internationalized player interface, Russian locale

Most player-interfaced features such as event responders, signs, and
some player commands now have their messages stored externally in a
resource bundle. This allows for easy localization of the plugin by
copying the main messages.properties file and translating all the
messages into the language of choice.

Also thanks to @AlexMerser21 for the partial russian localization of the
plugin. This means that War servers can now show messages in the russian
language simply by starting the minecraft server with the flag
-Duser.language=ru.