Poll WIP (#231):

* mod_muc_poll
* feature detection and create poll button in Converse

server/lib/prosody/config/content.ts

@@ -248,6 +248,8 @@ class ProsodyConfigContent {
     if (chatTerms) {
       this.muc.set('muc_terms_global', new ConfigEntryValueMultiLineString(chatTerms))
     }
+
+    this.muc.add('modules_enabled', 'muc_poll')
   }
 
   useAnonymous (autoBanIP: boolean): void {