[Glitch] Change language to be carried over on reply

Port 14d7cf39f4 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/reducers/compose.js

@@ -419,6 +419,10 @@ export default function compose(state = initialState, action) {
       map.set('preselectDate', new Date());
       map.set('idempotencyKey', uuid());
 
+      if (action.status.get('language')) {
+        map.set('language', action.status.get('language'));
+      }
+
       if (action.status.get('spoiler_text').length > 0) {
         let spoiler_text = action.status.get('spoiler_text');
         if (action.prependCWRe && !spoiler_text.match(/^re[: ]/i)) {