[gtk/a11y/atcontext-realize] Set accessible label on GTK Demo's primary menu

[Emmanuele Bassi <ebassi src gnome org>]

commit 425d8ad02a39f61f370fbf552877bc8241fde2b2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Nov 4 16:41:31 2020 +0000

    Set accessible label on GTK Demo's primary menu
    
    Otherwise its label is going to be "GtkMenuButton".

 demos/gtk-demo/main.ui | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/demos/gtk-demo/main.ui b/demos/gtk-demo/main.ui
index b685b93ce8..9dc7aba86c 100644
--- a/demos/gtk-demo/main.ui
+++ b/demos/gtk-demo/main.ui
@@ -43,6 +43,9 @@
             <property name="valign">center</property>
             <property name="menu-model">gear_menu</property>
             <property name="icon-name">open-menu-symbolic</property>
+            <accessibility>
+              <property name="label" translatable="yes">Primary menu</property>
+            </accessibility>
           </object>
         </child>
       </object>