Acconut name isn't change in the popup menu of notification area icon

Versions

• OS: Debian testing (buster)
• Gajim version: 0.99.1 (debian package gajim 1.0.0-beta1-1)
• GTK version: 3.22.26
• Python-nbxmpp version: 0.6.3

Steps to reproduce the problem

1. Add an account (e.g. who@example.net). Account label is set automatically, probably used the domain name (example.net).

2. Click the account and click a pen icon, edit the account label (e.g. main).

Then,

1. Right-click on a Gajim icon in Notification area. Pop up menu is shown.

2. Hover over Start Chat... (or Join Group Chat or Send Single Message...). Submenu is shown.

Expected behavior

Acount label in the submenu is after the change (main).

Actual behavior

Acount label in the submenu is before the change (example.net).