Adapting “APA Style 7th edition (Numeric, superscript)” CSL for multilingual EN/DE APA7 requirements

I’m trying to adapt the CSL style APA Style 7th edition (Numeric, superscript) for Zotero, but unfortunately I haven’t managed to implement the required changes myself. My requests are based on the APA 7 Manual.

I would be very grateful if someone could either adapt the style or point me to the exact CSL sections/macros that I would need to modify (ideally with copy-paste examples).

The changes I would like to make are the following:

* For English items (language = en), I would like titles to appear in sentence case. German items (language = de) should remain exactly as entered in Zotero (no automatic sentence case conversion).
* For books (monographs, edited books, and book chapters), I would like:
* English items (language = en) to show 4th ed. instead of 4th edn
* German items (language = de) to show 4. Aufl.
* For edited books and book chapters, I would like:
* English items:
* Ed. for singular editors
* Eds. for plural editors
* German items:
* Hrsg.
* For conference papers, I would like square brackets after the title but before the period, so that the contribution type (e.g. Presentation) can be specified.
* For legal materials/statutes, I would like the title to be formatted in italics.
* For webpages, websites, and newspaper articles, I would like the word “Retrieved” to be omitted.

Has anyone already implemented similar changes or could help me with the CSL customization?

Thank you very much in advance for checking my request and for any support.
  • The first bullet point, the style does that already: you should enter English title in sentence case: https://www.zotero.org/support/kb/sentence_casing

    CSL doesn't support language-specific terms within a single bibliography (i.e. you can have APA English or German, but not both depending on the language of the work. Zotero (unofficially) supports an unofficial CSL variant, csl-m, which can do that and you can find some threads on this, but it's a bit involved.
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