gmoccapy: change text to icons on undo/redo buttons to fit window size

For some translations the text for the search/replace buttons is too wide to fit the smallest window size.
The result is that the window width increases in edit mode.
Changing the text on the undo and redo buttons to icons gives enough space.

Author: hansu

src/emc/usr_intf/gmoccapy/gmoccapy.glade

@@ -159,6 +159,18 @@
     <signal name="value-changed" handler="on_adj_y_pos_popup_value_changed" swapped="no"/>
   </object>
   <object class="GtkTextBuffer" id="alarm_buffer"/>
+  <object class="GtkImage" id="edit-redo">
+    <property name="visible">True</property>
+    <property name="can-focus">False</property>
+    <property name="icon-name">edit-redo</property>
+    <property name="icon_size">5</property>
+  </object>
+  <object class="GtkImage" id="edit-undo">
+    <property name="visible">True</property>
+    <property name="can-focus">False</property>
+    <property name="icon-name">edit-undo</property>
+    <property name="icon_size">5</property>
+  </object>
   <object class="GtkFileFilter" id="ff_file_to_load"/>
   <object class="GtkFileFilter" id="filefilter1"/>
   <object class="EMC_Action_Open" id="hal_action_open"/>
@@ -1807,14 +1819,18 @@
                             <property name="can-focus">False</property>
                             <child>
                               <object class="GtkButton" id="btn_undo">
-                                <property name="label" translatable="yes">Undo</property>
                                 <property name="use-action-appearance">False</property>
                                 <property name="name">gcode_edit</property>
                                 <property name="height-request">48</property>
                                 <property name="visible">True</property>
                                 <property name="can-focus">False</property>
                                 <property name="receives-default">False</property>
+                                <property name="tooltip-text" translatable="yes">Undo</property>
                                 <property name="valign">center</property>
+                                <property name="margin-start">2</property>
+                                <property name="margin-end">2</property>
+                                <property name="image">edit-undo</property>
+                                <property name="image-position">top</property>
                                 <signal name="clicked" handler="on_btn_undo_clicked" swapped="no"/>
                               </object>
                               <packing>
@@ -1879,6 +1895,7 @@
                                 <property name="visible">True</property>
                                 <property name="can-focus">True</property>
                                 <property name="valign">center</property>
+                                <property name="hexpand">True</property>
                                 <property name="invisible-char">●</property>
                                 <property name="primary-icon-activatable">False</property>
                                 <property name="secondary-icon-activatable">False</property>
@@ -1917,6 +1934,7 @@
                                 <property name="visible">True</property>
                                 <property name="can-focus">True</property>
                                 <property name="valign">center</property>
+                                <property name="hexpand">True</property>
                                 <property name="invisible-char">●</property>
                                 <property name="primary-icon-activatable">False</property>
                                 <property name="secondary-icon-activatable">False</property>
@@ -2014,14 +2032,17 @@
                             </child>
                             <child>
                               <object class="GtkButton" id="btn_redo">
-                                <property name="label" translatable="yes">Redo</property>
                                 <property name="use-action-appearance">False</property>
                                 <property name="name">gcode_edit</property>
                                 <property name="height-request">48</property>
                                 <property name="visible">True</property>
                                 <property name="can-focus">False</property>
                                 <property name="receives-default">False</property>
+                                <property name="tooltip-text" translatable="yes">Redo</property>
                                 <property name="valign">center</property>
+                                <property name="margin-start">2</property>
+                                <property name="margin-end">2</property>
+                                <property name="image">edit-redo</property>
                                 <signal name="clicked" handler="on_btn_redo_clicked" swapped="no"/>
                               </object>
                               <packing>