changed zeroconf tooltip a bit

data/glade/accounts_window.glade

@@ -65,7 +65,7 @@
 	  <property name="visible">True</property>
 	  <property name="tooltip" translatable="yes">If you have 2 or more accounts and it is checked, Gajim will list all contacts as if you had one account</property>
 	  <property name="can_focus">True</property>
-	  <property name="label" translatable="yes">_Merge accounts</property>
+	  <property name="label" translatable="yes">Mer_ge accounts</property>
 	  <property name="use_underline">True</property>
 	  <property name="relief">GTK_RELIEF_NORMAL</property>
 	  <property name="focus_on_click">True</property>
@@ -95,7 +95,7 @@
       <child>
 	<widget class="GtkCheckButton" id="enable_zeroconf_checkbutton">
 	  <property name="visible">True</property>
-	  <property name="tooltip" translatable="yes">If you check it, all local contacts that use a Bonjour compatible chat client (like iChat, Adium, Trillian or gaim) will be shown in roster. You don't need a jabber server for it.</property>
+	  <property name="tooltip" translatable="yes">If checked, all local contacts that use a Bonjour compatible chat client (like iChat, Trillian or Gaim) will be shown in roster. You don't need a jabber server for it.</property>
 	  <property name="can_focus">True</property>
 	  <property name="label" translatable="yes">_Enable link-local messaging</property>
 	  <property name="use_underline">True</property>