[IMP] website_mail: rename newsletter mail group to discussion group

to avoid confusion with mass mailing mailing lists and newsletters.

bzr revid: tde@openerp.com-20140509125118-obvdjkgreyiez8k9

addons/website_mail/data/mail_groups.xml

@@ -3,9 +3,9 @@
     <data noupdate="1">
 
         <record model="mail.group" id="group_all_employees">
-            <field name="name">Newsletter</field>
+            <field name="name">Discussion Group</field>
             <field name="public">public</field>
-            <field name="description">Public Newsletter.</field>
+            <field name="description">Public Discussion Group</field>
         </record>
 
     </data>