[libadwaita/wip/exalm/demo: 6/9] demo: Add a mnemonic for Preferences in primary menu

[Alexander Mikhaylenko <alexm src gnome org>]

commit 60fdfc9e36cc554d7e9a7b9532cb1a9236edeb52
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Oct 13 15:41:04 2021 +0500

    demo: Add a mnemonic for Preferences in primary menu

 demo/adw-demo-window.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/demo/adw-demo-window.ui b/demo/adw-demo-window.ui
index 5c594863..770a1e78 100644
--- a/demo/adw-demo-window.ui
+++ b/demo/adw-demo-window.ui
@@ -6,7 +6,7 @@
   <menu id="primary_menu">
     <section>
       <item>
-        <attribute name="label" translatable="yes">Preferences</attribute>
+        <attribute name="label" translatable="yes">_Preferences</attribute>
         <attribute name="action">app.preferences</attribute>
       </item>
     </section>