[Tex/LaTex] RevTex 4-2: Package babel Error: You haven’t defined the language en yet

Question

I am RevTex version 4-2 in combination with a Zotero-generated bib file. The bib file contains a lot of "random" entries in the "Language" field, such as "en", "eng", etc. These entries were automatically generated when adding the papers. RevTex 4-1 could deal with this bib file just fine. However, with RevTex 4-2, I get a lot of babel error messages related to the bibliography.

My question is: Is there any way to ignore the "Language" field in the bib file with RevTex 4-2, as it was apparently done in RevTex 4-1?

Note: I would like to avoid any solutions that require me to manually change > 1000 entries in my paper database to remove or correct the language entry.

Edit. Here is a minimal example:

\documentclass{revtex4-2}
\usepackage[english]{babel}
\begin{document}
\nocite{kubota_stress-induced_2012}
\nocite{kubota_stress-induced_2012_2}
% \bibliographystyle{apsrev4-1}
\bibliography{references}
\end{document}

Where references.bib reads

@article{kubota_stress-induced_2012,
    title = {Stress-{Induced} {Perpendicular} {Magnetization} in {Epitaxial} {Iron} {Garnet} {Thin} {Films}},
    volume = {5},
    issn = {1882-0786},
    url = {https://iopscience.iop.org/article/10.1143/APEX.5.103002/meta},
    doi = {10.1143/APEX.5.103002},
    language = {en},
    number = {10},
    urldate = {2019-09-07},
    journal = {Applied Physics Express},
    author = {Kubota, Masashi and Tsukazaki, Atsushi and Kagawa, Fumitaka and Shibuya, Keisuke and Tokunaga, Yusuke and Kawasaki, Masashi and Tokura, Yoshinori},
    month = sep,
    year = {2012},
    pages = {103002}
}


@article{kubota_stress-induced_2012_2,
    title = {Stress-{Induced} {Perpendicular} {Magnetization} in {Epitaxial} {Iron} {Garnet} {Thin} {Films}},
    volume = {5},
    issn = {1882-0786},
    url = {https://iopscience.iop.org/article/10.1143/APEX.5.103002/meta},
    doi = {10.1143/APEX.5.103002},
    number = {10},
    urldate = {2019-09-07},
    journal = {Applied Physics Express},
    author = {Kubota, Masashi and Tsukazaki, Atsushi and Kagawa, Fumitaka and Shibuya, Keisuke and Tokunaga, Yusuke and Kawasaki, Masashi and Tokura, Yoshinori},
    month = sep,
    year = {2012},
    pages = {103002}
}

When I un-comment the bibliographystyle line, everything works fine. It seems that the new bibliographystyle changes the .bbl title entry from

\bibfield  {title}{\bibinfo {title} {Stress-{Induced} {Perpendicular} ...

to

\bibfield  {title}{{\selectlanguage {en}\bibinfo {title} {Stress-{Induced} {Perpendicular} ...

I guess one has to edit the bst file, or just use the old style.

Answer 1

I recommend you to install the Better BibTeX for Zotero. It solves many issues with BibTeX export. When you have Better BibTeX installed, you can skip the export of language fields.

In Zotero, select Edit -> Preferences -> Better BibTeX -> Export and set Fields to omit from export to "language"