tdf#116448 - Function "Skip empty cells" unclear

Tooltip added

Change-Id: I098f0680e3240535fae0797e421b5de479adff02
Reviewed-on: https://gerrit.libreoffice.org/51741Reviewed-by: Laurent BP <laurent.balland-poirier@laposte.net>
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

sc/uiconfig/scalc/ui/pastespecial.ui

 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.18.3 -->
+<!-- Generated with glade 3.20.4 -->
 <interface domain="sc">
   <requires lib="gtk+" version="3.18"/>
   <object class="GtkImage" id="img_paste_transpose">
@@ -473,6 +473,7 @@
                             <property name="visible">True</property>
                             <property name="can_focus">True</property>
                             <property name="receives_default">False</property>
+                            <property name="tooltip_text" translatable="yes" context="pastespecial|skip_empty">If enabled, blank cells in source will not override the target.</property>
                             <property name="use_underline">True</property>
                             <property name="xalign">0</property>
                             <property name="draw_indicator">True</property>

sc/uiconfig/scalc/ui/textimportcsv.ui

 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.18.3 -->
+<!-- Generated with glade 3.20.4 -->
 <interface domain="sc">
   <requires lib="gtk+" version="3.18"/>
   <requires lib="LibreOffice" version="1.0"/>
@@ -560,10 +560,11 @@
                         </child>
                         <child>
                           <object class="GtkCheckButton" id="skipemptycells">
-                            <property name="label" translatable="yes" context="textimportcsv|skipemtycells">S_kip empty cells</property>
+                            <property name="label" translatable="yes" context="textimportcsv|skipemptycells">S_kip empty cells</property>
                             <property name="visible">True</property>
                             <property name="can_focus">True</property>
                             <property name="receives_default">False</property>
+                            <property name="tooltip_text" translatable="yes" context="textimportcsv|skipemptycells">If enabled, blank cells in source will not override the target.</property>
                             <property name="use_underline">True</property>
                             <property name="xalign">0</property>
                             <property name="draw_indicator">True</property>