Cleanup of Russian translation after merge of community-provided changes in https://github.com/jenkinsci/jenkins/commit/7828dcb46d9a18f88cc8e71046edc9ee91ed95e6

More info: https://groups.google.com/forum/#!topic/jenkinsci-dev/JXvazIROoQg

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>