fix: homogenize authoring format and place (#7034)

* 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>

books/free-programming-books-fa_IR.md

@@ -28,7 +28,7 @@
 
 * [الگوهای طراحی](https://holosen.net/what-is-design-pattern/) - Hossein Badrnezhad *(نیاز به ثبت نام دارد)*
 * [الگوهای طراحی در برنامه‌نویسی شیء‌گرا](https://github.com/khajavi/Practical-Design-Patterns)
-* [ترجمه آزاد کتاب کد تمیز](https://codetamiz.vercel.app) - Robert C. Martin et al.
+* [ترجمه آزاد کتاب کد تمیز](https://codetamiz.vercel.app) - Robert C. Martin, et al.
 
 
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