[evince] shell: Added mnemonic for highlight option in context menu

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 6f9598b9e36db5e4b70e0a453aa9578c9a656ad4
Author: Chayut Liewlom <ray daroonpat 2020 gmail com>
Date:   Tue Jun 22 01:49:02 2021 -0700

    shell: Added mnemonic for highlight option in context menu
    
    Added a mnemonic for the "Highlight Selected Text" option in drop-down context menu.
    
    Closes #1618

 shell/evince-menus.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/shell/evince-menus.ui b/shell/evince-menus.ui
index 26b0a06f..8a4f72a2 100644
--- a/shell/evince-menus.ui
+++ b/shell/evince-menus.ui
@@ -232,7 +232,7 @@
     </section>
     <section>
       <item>
-        <attribute name="label" translatable="yes">Highlight Selected Text</attribute>
+        <attribute name="label" translatable="yes">_Highlight Selected Text</attribute>
         <attribute name="action">win.annotate-selected-text</attribute>
         <attribute name='hidden-when'>action-disabled</attribute>
       </item>