Add illustrator creator type

[adunning]

Support CSL illustrator name. Usage examples: https://www.zotero.org/groups/2205533/items/LAQGPVEM, https://www.zotero.org/groups/2205533/items/IFACCHV4, https://www.zotero.org/groups/2205533/items/923SWN5N.

[adunning]

@dstillman Is this the correct way to add a CSL variable not yet represented by a Zotero field? I understand that labels need to be added in a separate location but I am not quite sure where to find them.

[Copilot]

Pull request overview

This PR adds support for the CSL illustrator creator type to enable proper citation of illustrated books in Zotero. The illustrator creator type is added to book and bookSection item types, and mapped to the corresponding CSL field.

Changes:

• Added illustrator creator type to the book item type
• Added illustrator creator type to the bookSection item type
• Added CSL mapping for illustrator to the corresponding CSL field name

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[Copilot]

The "illustrator" creator type has been added to the CSL names mapping, but it's missing localized strings in all 48 locale sections. Each locale's "creatorTypes" object needs an "illustrator" entry. For example, in the "af-ZA" locale around line 3712, an entry like "illustrator": "Illustrator" should be added between "host" and "interviewee" (in alphabetical order). This pattern needs to be repeated for all locales including ar, bg-BG, ca-AD, cs-CZ, da-DK, de-AT, de-CH, de-DE, el-GR, en-GB, en-US, es-CL, es-ES, es-MX, et-EE, eu, fa, fi-FI, fr-CA, fr-FR, gl-ES, he-IL, hr-HR, hu-HU, id-ID, is-IS, it-IT, ja-JP, km-KH, ko-KR, lt-LT, lv, nb-NO, nl-NL, nn-NO, pl-PL, pt-BR, pt-PT, ro-RO, ru-RU, sk-SK, sl-SI, sr-RS, sv-SE, ta-IN, th-TH, tr-TR, uk-UA, vi-VN, zh-CN, and zh-TW. Without these locale strings, the illustrator creator type will not display properly in the Zotero user interface for different languages.