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Monday, April 14, 2014
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I changed in :mod:`lino.modlib.attestations` the algorithm to find the
`body_template`: (1) the `AttestationType.content_type` field is no
longer nullable and (2) the template group is no longer
"attestations/Attestation" but determined by the model specified by
`content_type`. 

Concretely:

- /config/attestations/Attestation/aids_Aid.body.html --> 
  /modlib/aids/config/aids/Aid/aid_certificate.body.html

- /config/attestations/Attestation/cal_Guest.body.html --> 
  /modlib/cal/config/cal/Guest/presence_certificate.body.html


A bug fixed: The (virtual) `preview` field of :class:`Attestation
<lino.modlib.attestations.models.Attestation>` ignored
:meth:`get_print_language
<lino.modlib.attestations.models.Attestation.get_print_language>` and
displayed in the user's language instead.