Improve spelling (#836)

src/converse-muc.js

@@ -2058,15 +2058,15 @@
                                 'label_temporary': __('Temporary'),
                                 'label_unmoderated': __('Unmoderated'),
                                 'label_unsecured': __('Unsecured'),
-                                'tt_hidden': __('This room is not publically searchable'),
+                                'tt_hidden': __('This room is not publicly searchable'),
                                 'tt_mam_enabled': __('Messages are archived on the server'),
                                 'tt_membersonly': __('This room is restricted to members only'),
                                 'tt_moderated': __('This room is being moderated'),
                                 'tt_nonanonymous': __('All other room occupants can see your Jabber ID'),
                                 'tt_open': __('Anyone can join this room'),
                                 'tt_passwordprotected': __('This room requires a password before entry'),
-                                'tt_persistent': __('This room pesists even if it\'s unoccupied'),
-                                'tt_public': __('This room is publically searchable'),
+                                'tt_persistent': __('This room persists even if it\'s unoccupied'),
+                                'tt_public': __('This room is publicly searchable'),
                                 'tt_semianonymous': __('Only moderators can see your Jabber ID'),
                                 'tt_temporary': __('This room will disappear once the last person leaves'),
                                 'tt_unmoderated': __('This room is not being moderated'),