Feature-gate language picker

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

src/utils/features.ts

@@ -673,6 +673,15 @@ const getInstanceFeatures = (instance: Instance) => {
       v.software === TAKAHE && gte(v.version, '0.8.0'),
     ]),
 
+    /**
+     * Can select a language for statuses.
+     * @see POST /api/v1/statuses
+     */
+    postLanguages: any([
+      v.software === MASTODON,
+      v.software === PLEROMA && v.build === REBASED,
+    ]),
+
     /**
      * Can set privacy scopes on statuses.
      * @see POST /api/v1/statuses