Fix translation plugin for issue1955

Since the merge of tree and list view, view_type doesn't exist anymore

tryton/plugins/translation/__init__.py

@@ -8,7 +8,7 @@ _ = gettext.gettext
 def translate_view(datas, parent):
     model = datas['model']
     Window.create(False, 'ir.translation', res_id=False,
-            domain=[('model', '=', model)], view_type='form',
+            domain=[('model', '=', model)],
             mode=['tree', 'form'], window=parent)
 
 def get_plugins(model):