Use None as yoptions

GTK+-3 does not support to have int as options so we must use None which works
also on GTK+-2.

issue6804
review40711002

tryton/gui/window/view_form/view/form_gtk/widget.py

@@ -177,9 +177,9 @@ class TranslateDialog(NoModal):
             label.set_mnemonic_widget(widget)
             self.widget.translate_widget_set(widget, fuzzy_value)
             self.widget.translate_widget_set_readonly(widget, True)
-            yopt = 0
+            yopt = None
             if self.widget.expand:
-                yopt |= gtk.EXPAND | gtk.FILL
+                yopt = gtk.EXPAND | gtk.FILL
             table.attach(widget, 1, 2, i, i + 1, yoptions=yopt)
             editing = gtk.CheckButton()
             editing.connect('toggled', self.editing_toggled, widget)