Update of Dutch errmsg translations (not complete yet)
errmsg.h:
  Fixup of changed error message file path in comment
authors.h:
  Ego add.


include/errmsg.h:
  Fixup of changed error message file path in comment
sql/authors.h:
  Ego add.
sql/share/errmsg.txt:
  Update of Dutch errmsg translations (not complete yet)