Add optional plone.multilingual support.

Conflicts:
	seantis/reservation/utils.py
	setup.py
Add support for language idependent fields.
Add comment.
Use correct uuid in settings panel.

Conflicts:
	seantis/reservation/settings.py
Make additional formsets language independent.
Display translated titles for additional formsets.

Conflicts:
	seantis/reservation/interfaces.py
Translate labels/content of additional formsets.

Conflicts:
	seantis/reservation/form.py
	seantis/reservation/templates/reservations.pt
Fixes tests.

Use macros from macros.pt in reservations.pt.
Rename methods used in macros in the ReservationDataView class.
Use FTI id instead of schema name as FTI identifier.

This enables custom-form-support for FTIs from a generic
setup profile.
Merge pull request #35 from 4teamwork/merge-multilingual

Add optional multilingual support