Design.plone.ioprenoto

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- Update redturtle.prenotazioni version to >= 2.1.1
[folix-01]
- Add the UO.contact_info field to bookable-uo-list response.
[folix-01]

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- Workaround booking_url in bookings differente per gestori e cittadini
[mamico]

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- Fix bookings overrides
[mamico]

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- Move redirect for anonymous in the frontend
[mamico]

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- Fixed the manager message stringinterp adapter.
[folix-01]

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- Fix bad stringinterp adapter definition.
[folix-01]
- Remove "description" field to customizable PrenotazioniFolder fields.
[cekk]
- Customize booking-schema endpoint to set *description* as always required.
[cekk]
- Url operator
[mamico]