mcgrewI see an option when posting to specify the language you're posting in but that doesn't seem to be exposed anywhere as far as I can tell. Maybe it's just intended for filtering purposes.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.