Ftw-billboard

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- Count only visible ads on category overview.
[mathias.leimgruber]

- Improve prev. upgrade step by idexing only BillboardAds.
[mathias.leimgruber]

- Added separate expiration date.
[lknoepfel]

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- Fix validator translations.
[mathias.leimgruber]

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- Updated translations.
[tschanzt]

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- Show description on simple upload view (file, image)
[mathias.leimgruber]

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- Hide upload-action for richtext fields.
[mathias.leimgruber]

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- Update German translations.
[jone]

- Removed broken image in ads view.
[Julian Infanger]

- Implement billboard conditions.
[mathias.leimgruber]

- Plone 4.3 compatibility.
[mathias.leimgruber]