Am I able to filter staff lists by the primary languages of Organization Staff?

InitLive is now Bloomerang Volunteer—a new name, a new look, and a new integration. Bloomerang Volunteer works just like InitLive. You can do everything you always do, and in the same way. 

See what's changed.

Yes, in the Staff Tab you are able to filter by preferred language using the General Organization Filters. Doing so will filter the Organization Staff list down to the users that have the specified language as their preferred.