Fix AR.Client visibility: normal->visible
Re-translate strings for bika_listing titles

There is something very strange happening here.  The values are
translated in python code, then translated again in the TAL using
view.context.translate().

If these steps are not all performed, the strings do not translate.
AT Widget label/description - convert to plain strings.

The default AT machine does not expect msgids here, and fails
to translate them (expecting TAL to do so, I guess).  I have changed
this to force translation but:

a) new field label/descriptions must be added manually to the POT files
b) all addon products should be converted
c) Values must be translated manually if printed in our own templates.