add stock undo button text and map to gtk-undo

Change-Id: I9109dfc6293c9de399c25bea957712eb00d181be

cui/uiconfig/ui/spellingdialog.ui

 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <!-- interface-requires gtk+ 3.0 -->
+  <!-- interface-requires LibreOffice 1.0 -->
   <object class="GtkDialog" id="SpellingDialog">
     <property name="can_focus">False</property>
     <property name="border_width">5</property>
@@ -46,11 +47,12 @@
             </child>
             <child>
               <object class="GtkButton" id="undo">
-                <property name="label" translatable="yes">_Undo</property>
+                <property name="label">gtk-undo</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
                 <property name="use_underline">True</property>
+                <property name="use_stock">True</property>
               </object>
               <packing>
                 <property name="expand">False</property>
@@ -93,6 +95,7 @@
             <child>
               <object class="svxcorelo-SvxLanguageBox" id="languagelb">
                 <property name="visible">True</property>
+                <property name="can_focus">False</property>
                 <property name="halign">end</property>
               </object>
               <packing>

vcl/inc/svids.hrc

@@ -159,6 +159,7 @@
 #define SV_BUTTONTEXT_SAVE                  10118
 #define SV_BUTTONTEXT_OK_NOMNEMONIC         10119
 #define SV_BUTTONTEXT_CANCEL_NOMNEMONIC     10120
+#define SV_BUTTONTEXT_UNDO                  10121
 
 #define SV_STDTEXT_FIRST                    SV_STDTEXT_SERVICENOTAVAILABLE
 #define SV_STDTEXT_SERVICENOTAVAILABLE      10210

vcl/source/src/btntext.src

@@ -124,3 +124,8 @@ String SV_BUTTONTEXT_SAVE
 {
     Text [ en-US ] = "~Save";
 };
+
+String SV_BUTTONTEXT_UNDO
+{
+    Text [ en-US ] = "~Undo " ;
+};

vcl/source/window/builder.cxx

@@ -579,6 +579,8 @@ namespace
             return (VclResId(SV_BUTTONTEXT_APPLY).toString());
         else if (rType == "gtk-save")
             return (VclResId(SV_BUTTONTEXT_SAVE).toString());
+        else if (rType == "gtk-undo")
+            return (VclResId(SV_BUTTONTEXT_UNDO).toString());
         SAL_WARN("vcl.layout", "unknown stock type: " << rType.getStr());
         return OUString();
     }