Using the new language implementation wasn't behaving as expected.
No matter what LANGUAGE_CHOICE was set to it would always take the en branch.
I revamped it a bit to use a macro to create the language include file name. This required a slight tweak to the RU declaration since it's special-cased in a couple places in code.
This is an attempt to pull my changes from #1222 over.
Caleb Anderson
Scott Lahteine