Yandex recently added support for two new languages of Russia: Meadow Mari, also known as simply Mari (mhr) and Hill Mari (mrj). There are Wikipedia sites in both of these languages and both should be enabled.
It would be nice to do this soon, because both of these languages are in the Uralic family, and on September 20 there will be a Wikimieda event in the city of Izhevsk (Russian), on the topic of Uralic languages.