* fix: homogenize authors format and place
- use colon as author separator (replaces `&`, `and`, `y`, `e`, `et`...)
- ensures is placed after resource title, not part of itself `title - author`
- `et al.` as special author/token to group many
* remove double comma
* fix: recover traducer role notations as `trad.:`
* detect and apply some `trad.:`s role anotation
* chore: `trad.:` to `trl.:`
Apply suggestion made by Eric at https://github.com/EbookFoundation/free-programming-books/pull/7034#discussion_r954014539
Co-authored-by: Eric Hellman <eric@hellman.net>
* Sort author - format
* fix: remove empty authors (dash is alone)
Used regex: `-\s+(\(|$)`
* format: change to `edt.:` role
Definition list at https://www.loc.gov/marc/relators/relaterm.html
Co-authored-by: Eric Hellman <eric@hellman.net>
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