Add missing claims attachments to entity actors

[jum-s]

Add attachments for properties not done yet:

• birth/death of authors with same formatting as an authors page
• isbn-10 and 13 (with a link to the edition)

Following #579 & #587

I believe most of this issue's code will be gravitating around server/controllers/activitypub/lib/build_attachements.js (a file that could be renamed to fix typo build_attachements.js => build_attachments.js)