do not translate unused string

plugins/plugin_installer/config_dialog.ui

@@ -3,7 +3,7 @@
   <requires lib="gtk+" version="2.16"/>
   <!-- interface-naming-policy toplevel-contextual -->
   <object class="GtkTextBuffer" id="textbuffer1">
-    <property name="text" translatable="yes">Plug-in decription should be displayed here. This text will be erased during PluginsWindow initialization.</property>
+    <property name="text">Plug-in decription should be displayed here. This text will be erased during PluginsWindow initialization.</property>
   </object>
   <object class="GtkWindow" id="window1">
     <child>
@@ -44,7 +44,7 @@
               <object class="GtkLabel" id="plugin_name_label1">
                 <property name="visible">True</property>
                 <property name="xalign">0</property>
-                <property name="label" translatable="yes">&lt;empty&gt;</property>
+                <property name="label">&lt;empty&gt;</property>
                 <property name="selectable">True</property>
                 <property name="ellipsize">end</property>
               </object>
@@ -72,7 +72,7 @@
                     <property name="visible">True</property>
                     <property name="xalign">0</property>
                     <property name="xpad">6</property>
-                    <property name="label" translatable="yes">&lt;empty&gt;</property>
+                    <property name="label">&lt;empty&gt;</property>
                     <property name="selectable">True</property>
                     <property name="ellipsize">end</property>
                   </object>
@@ -101,7 +101,7 @@
                 </child>
                 <child>
                   <object class="GtkLinkButton" id="plugin_homepage_linkbutton1">
-                    <property name="label" translatable="yes">button</property>
+                    <property name="label">button</property>
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>