DOCBOOK-APPS: dbcommon.dsl: author-list-string

author-list-string should format authors in an authorgroup depending on
the chosen language, e.g.:

- English:
  Firstname1 Surname1, Firstname2 Surname2, and Firstname3 Surname3

- German:
  Firstname1 Surname1, Firstname2 Surname2 und Firstname3 Surname3
                                         ===
- Other languages 
  ???

Michael
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