Fixed normal bug EXT-6899 (String changes to default and null results Groups List help text)

* Updated help texts in Groups List according to requirements in the ticket.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/260/

--HG--
branch : product-engine

indra/newview/skins/default/xui/en/panel_people.xml

@@ -35,10 +35,10 @@
      -->
     <string
      name="no_filtered_groups_msg"
-     value="[secondlife:///app/search/groups Try finding the group in search?]" />
+     value="Didn't find what you're looking for? Try [secondlife:///app/search/groups Search]." />
     <string
      name="no_groups_msg"
-     value="[secondlife:///app/search/groups Try searching for some groups to join.]" />
+     value="Looking for Groups to join? Try [secondlife:///app/search/groups Search]." />
     <filter_editor
      follows="left|top|right"
      height="23"