tdf#91063 Change show legend label to tooltip in chart sidebar

Change-Id: I3d4cd44527bd9687df002543055286daf6e24a65
Reviewed-on: https://gerrit.libreoffice.org/19370Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>

chart2/uiconfig/ui/sidebarelements.ui

@@ -97,12 +97,13 @@
                     <property name="can_focus">False</property>
                     <child>
                       <object class="GtkCheckButton" id="checkbutton_legend">
-                        <property name="label" translatable="yes">Show Legend</property>
+                        <property name="tooltip_text" translatable="yes">Show Legend</property>
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
                         <property name="receives_default">False</property>
                         <property name="xalign">0</property>
                         <property name="draw_indicator">True</property>
+                        <property name="margin_right">5</property>
                       </object>
                       <packing>
                         <property name="left_attach">0</property>