reset the licence information

when using the GNU2 setting in GtkAboutDialog, the licence
button does nothing.
Fix #1080

guake/data/about.glade

@@ -1,24 +1,36 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.18.3 -->
+<!-- Generated with glade 3.20.0 -->
 <interface>
-  <requires lib="gtk+" version="3.18"/>
+  <requires lib="gtk+" version="3.20"/>
   <object class="GtkAboutDialog" id="aboutdialog">
-    <property name="visible">True</property>
     <property name="can_focus">False</property>
-    <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
-    <property name="border_width">5</property>
-    <property name="title" translatable="yes">About Guake</property>
     <property name="resizable">False</property>
-    <property name="modal">True</property>
     <property name="window_position">center-always</property>
     <property name="type_hint">normal</property>
+    <property name="program_name">Glade</property>
     <property name="copyright" translatable="yes">Copyright 2013-2018 Gaetan Semet
 Copyright 2007-2010 Lincoln de Sousa
 Copyright 2007 Gabriel Falcão</property>
     <property name="comments" translatable="yes">Guake is an easy to access
 terminal based on FPS games terminal</property>
     <property name="website">http://guake-project.org</property>
-    <property name="website_label">http://guake-project.org</property>
+    <property name="website_label" translatable="yes">http://guake-project.org</property>
+    <property name="license" translatable="yes">Guake is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public
+License as published by the Free Software Foundation;
+either version 2 of the License, or (at your option) any 
+later version.
+
+Guake is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied
+warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE.  See the GNU General Public
+License for more details.
+
+You should have received a copy of the GNU General 
+Public License along with Guake; if not, write to the Free
+Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+Boston, MA  02110-1301 USA</property>
     <property name="authors">Gaetan Semet &lt;[email protected]&gt;
 Lincoln de Sousa &lt;[email protected]&gt;
 Pierre-Yves Chibon (Pingou) &lt;[email protected]&gt;
@@ -42,26 +54,19 @@ Sangwoo Joo &lt;[email protected]&gt; Korean
     </property>
     <property name="artists">Gabriel Falcao &lt;[email protected]&gt;</property>
     <property name="logo_icon_name">image-missing</property>
-    <property name="license_type">gpl-2-0</property>
-    <signal name="response" handler="gtk_widget_destroy" object="aboutdialog" swapped="yes"/>
     <child internal-child="vbox">
       <object class="GtkBox" id="dialog-vbox1">
-        <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
         <property name="orientation">vertical</property>
         <property name="spacing">2</property>
         <child internal-child="action_area">
           <object class="GtkButtonBox" id="dialog-action_area1">
-            <property name="visible">True</property>
             <property name="can_focus">False</property>
-            <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
             <property name="layout_style">end</property>
           </object>
           <packing>
             <property name="expand">False</property>
             <property name="fill">False</property>
-            <property name="pack_type">end</property>
             <property name="position">0</property>
           </packing>
         </child>