tdf#103170 make blank button labels not translatable

Change-Id: Ib919b9b5acfed3cce57c9e4d22f35141f485e749
Reviewed-on: https://gerrit.libreoffice.org/31079Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>

sw/uiconfig/swriter/ui/notebookbar_groups.ui

@@ -1069,7 +1069,7 @@
                         </child>
                         <child>
                           <object class="GtkButton" id="growb">
-                            <property name="label" translatable="yes"> </property>
+                            <property name="label"> </property>
                             <property name="width_request">35</property>
                             <property name="height_request">30</property>
                             <property name="visible">True</property>
@@ -1091,7 +1091,7 @@
                         </child>
                         <child>
                           <object class="GtkButton" id="shrinkb">
-                            <property name="label" translatable="yes"> </property>
+                            <property name="label"> </property>
                             <property name="width_request">35</property>
                             <property name="height_request">30</property>
                             <property name="visible">True</property>