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-ru.md

@@ -204,7 +204,7 @@
 * [Эффективный Go](https://github.com/Konstantin8105/Effective_Go_RU)
 * [Go в примерах](https://web.archive.org/web/20210727024101/https://gobyexample.ru) *(:card_file_box: archived)*
 * [Go для PHP-разработчиков](https://pahanini.gitbooks.io/golang-for-php-developers/content/) - Pavel Tetyaev (gitbook)
-* [The Little Go Book (перевод)](https://sefus.ru/little-go-book) - Karl Seguin, Roman Dolgolopov, Evgeny Popov, Alexander Dunin ([HTML](https://github.com/sefus/the-little-go-book/blob/master/ru/go.md), [EPUB](https://sefus.ru/dl/go.epub))
+* [The Little Go Book (перевод)](https://sefus.ru/little-go-book) - Karl Seguin, `trl.:` Roman Dolgolopov, Evgeny Popov, Alexander Dunin ([HTML](https://github.com/sefus/the-little-go-book/blob/master/ru/go.md), [EPUB](https://sefus.ru/dl/go.epub))
 
 
 ### Haskell