Improve tooltip of update checkbox of restore window

tryton/gui/window/dbrestore.py

@@ -144,8 +144,9 @@ class DBRestore(object):
         label_db_update.set_alignment(1, 0.5)
         table.attach(label_db_update, 0, 1, 5, 6, yoptions=gtk.FILL)
         self.check_update = gtk.CheckButton()
-        self.tooltips.set_tip(self.check_update, _('If checked, allow ' \
-                'to restore database from an older version.'))
+        self.tooltips.set_tip(self.check_update, _('Check for an automatic ' \
+            'database update after restoring a database from a previous ' \
+            'Tryton version.'))
         self.check_update.set_active(True)
         table.attach(self.check_update, 1, 3, 5, 6, yoptions=gtk.FILL)
         # Buttons and events