Howto use babel 'dutch', biblatex and chicago-notes at the same time?

Question

I started to learn LaTeX in the hope to gain speed and accuracy with references in my philosophical articles. But after five days struggling I am still stuck. Of course I am trying to do complex things without knowing all the basics, but hey! I am an engineer, so I don't do manuals from beginning to the end :-)

\documentclass[a4paper,12pt,dutch]{article}
%\usepackage[notes]{biblatex-chicago}
\usepackage[style=chicago-authordate,babel=other, backend=biber]{biblatex}
\usepackage[dutch]{babel}
\addbibresource{./myreferences.bib}

When I compile like this the bibliography works fine and uses Dutch, but the footnotes are (of course) Chicago style authordate. The footnote that uses the Dutch translation of 'Translated by' works perfect.

What is the name of the chicagostyle notes? I tried chicago-notes but then I received warnings:

'babel/polyglossia' detected but 'csquotes' missing.

Bibliography string 'cbytranslator' undefined(biblatex) at entry 'Foo'

Using the other \usepackage (line 2) and commenting out the other (line 3), I get the same warnings, and in this case in the footnote the cbytranslator is not resolved. (I did even reinstall csquotes from CTAN).

cbytranslator should give me the dutch translation of 'Translated by'. Can someone give me a hint or a solution?? Thank you very much!

Edited: Maybe my myreference.bib entry is incorrect?

@mvbook{Foo,
    author = {Plato},
    title = {De Staat},
    date = {2009},
    translator = {Xavier De Win},
    titleaddon = {Alcibiades I – De Staat – De Staatsman – Critias},
    volumes = {3},
    publisher = {Pelckmans},
    location = {Kapellen},
}

Here is a snippet:

\documentclass[a4paper,12pt,dutch]{article}
\usepackage[notes]{biblatex-chicago}
\usepackage{csquotes}
%\usepackage[style=chicago-notes,babel=dutch, backend=biber]{biblatex}
\usepackage[dutch]{babel}
\addbibresource{./myreferences.bib}
\begin{document}
\null\vfill% just for the example

This is some text.\footcite{Foo} 


\printbibliography

\end{document}

Answer 1

The warning

'babel/polyglossia' detected but 'csquotes' missing.

is unrelated to the main issue at hand here, but it is still a good idea to load csquotes with biblatex. (As discussed in the comments you should not have to install the package manually. Install packages through your distribution - tlmgr or MikTeX Console.)

---

The main issue here is that biblatex-chicago has no Dutch localisation. Standard biblatex has a Dutch localisation, so most things still work fine, but some biblatex-chicago-specific strings may not be available. One of these strings is cbytranslator. That's why you get the warning

Package biblatex Warning: Bibliography string 'cbytranslator' undefined
(biblatex)                at entry 'destaat' on input line 25.

If you want full support for all translations needed by biblatex-chicago, you can get one of its .lbx files (for example from CTAN: https://ctan.org/tex-archive/macros/latex/contrib/biblatex-contrib/biblatex-chicago/latex/lbx) and translate it into Dutch. If you complete the file, you may want to contact the author of biblatex-chicago and ask him to include it into his package.

If you only want this document to come out OK, you can define the required strings (those that biblatex warns about) on the fly.

First you need to declare the missing string with

\NewBibliographyString{<bibstring>}

and then you need to give its translation in

\DefineBibliographyStrings{dutch}{
  <bibstring> = {<Dutch translation>},
}

The full definition of the cbytranslator bibstring is a bit more tricky than usual, so I included a more straightforward example as well. See also biblatex-chicago: Change translator and editor description in the bibliography.

\documentclass[a4paper,12pt,dutch]{article}
\usepackage{babel}
\usepackage{csquotes}
\usepackage[notes]{biblatex-chicago}

\NewBibliographyString{cbyeditor}
\NewBibliographyString{cbytranslator}
\makeatletter
\DefineBibliographyStrings{dutch}{
  cbyeditor     = {geredigeerd door},
  cbytranslator = {\lbx@fromlang\ vertaald door},
}
\makeatother

\begin{filecontents}{\jobname.bib}
@mvbook{destaat,
  author     = {Plato},
  title      = {De Staat},
  date       = {2009},
  translator = {Xavier De Win},
  titleaddon = {Alcibiades I – De Staat – De Staatsman – Critias},
  volumes    = {3},
  publisher  = {Pelckmans},
  location   = {Kapellen},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
  \null\vfill% just for the example

  This is some text.\autocite{destaat} 

  \printbibliography  
\end{document}

Note that the issue mainly occurs in the citations, since biblatex-chicago defines new bibstrings for citations, but uses existing strings for the bibliography.

---

In general it is recommended to load the style of biblatex-chicago via the wrapper package, i.e.

\usepackage[notes]{biblatex-chicago}

or

\usepackage[authordate]{biblatex-chicago}

and not via biblatex directly (as in \usepackage[style=chicago-authordate,babel=other, backend=biber]{biblatex}), since the wrapper package automatically sets all required options.