Updating Converse upstream (with bootstrap5):

* bootstrap 5 compatibility
* other Converse updates integration
* hack to get the sidebar work as with Converse v10.
* modal onHide was renamed close.
* fix slow mode infobox margin.
* fix margin
* shorter action label, for better dropdown UX.

conversejs/custom/plugins/poll/modals/poll-form.js

@@ -13,8 +13,8 @@ class PollFormModal extends BaseModal {
     super.initialize()
   }
 
-  onHide () {
-    super.onHide()
+  close () {
+    super.close()
     api.modal.remove('livechat-converse-poll-form-modal')
   }