[gtranslator] help: Replace deprecated 'expanded' Mallard attribute

[Andre Klapper <aklapper src gnome org>]

commit 05dbeeac902f28403c651609b11e5af79babcf07
Author: Andre Klapper <a9016009 gmx de>
Date:   Sat Mar 2 21:59:07 2019 +0100

    help: Replace deprecated 'expanded' Mallard attribute

 help/C/gtr-shortcut-keys.page | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/help/C/gtr-shortcut-keys.page b/help/C/gtr-shortcut-keys.page
index f13c4dba..cf435652 100644
--- a/help/C/gtr-shortcut-keys.page
+++ b/help/C/gtr-shortcut-keys.page
@@ -1,5 +1,5 @@
 <page xmlns="http://projectmallard.org/1.0/";
-      xmlns:ui="http://projectmallard.org/experimental/ui/";
+      xmlns:ui="http://projectmallard.org/ui/1.0/";
       xmlns:its="http://www.w3.org/2005/11/its";
       type="guide" style="tip"
       id="gtr-shortcut-keys">
@@ -31,7 +31,7 @@
   <p>Use keyboard <gui>shortcut keys</gui> to perform common tasks faster than
   with the mouse and menus. The following table lists all of <app>Gtranslator's</app> shortcut keys.</p>
 
- <table rules="rows" frame="top bottom" ui:expanded="yes">
+ <table rules="rows" frame="top bottom" ui:expanded="true">
     <title>PO related shortcuts</title>
       <thead>
         <tr>
@@ -57,7 +57,7 @@
       </tbody>
     </table>
 
-    <table rules="rows" frame="top bottom" ui:expanded="yes">
+    <table rules="rows" frame="top bottom" ui:expanded="true">
     <title>String related shortcuts</title>
       <thead>
         <tr>
@@ -110,7 +110,7 @@
       </tbody>
     </table>
 
-    <table rules="rows" frame="top bottom"  ui:expanded="yes">
+    <table rules="rows" frame="top bottom"  ui:expanded="true">
     <title>TM related shortcuts</title>
       <thead>
         <tr>