Dutch: Various alternative translations

[LukeSerne]

While implementing TiU's Dutch APA localisation, I found they prescribe slightly different translations for these 3 translation keys. While these alternative translations seem to be only required by them, I figured I'd submit the here because they concern base biblatex translation strings.

\DeclareBibliographyStrings{dutch}{
    volume={{volume}{vol\adddot}},  % TiU prescribes "vol." instead of "deel"
    volumes={{volumes}{vols\adddot}},  % TiU prescribes "vols." instead of "delen"
    editors={{redacteurs}{reds\adddot}},  % current short form ("red.") is singular
}