From f35a3e44d0e9c957c227d517e975ae8049a64a23 Mon Sep 17 00:00:00 2001
From: Robin Morand <robin.morand@szh.ch>
Date: Wed, 1 Jul 2026 06:45:26 +0200
Subject: [PATCH] Set CSL item language so non-English titles are not wrongly
 title-cased
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getCitation() never set the item language, so citeproc assumed English and applied
English title-casing to fields like container-title, wrongly capitalizing lowercase
particles in non-English journal names (e.g. "Revue suisse de pédagogie spécialisée"
-> "Revue Suisse De pédagogie spécialisée"). Set language from the publication locale
(fallback to the context primary locale) so citeproc preserves the stored casing.
---
 CitationStyleLanguagePlugin.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CitationStyleLanguagePlugin.php b/CitationStyleLanguagePlugin.php
index e4f01c5..22097f2 100644
--- a/CitationStyleLanguagePlugin.php
+++ b/CitationStyleLanguagePlugin.php
@@ -431,6 +431,7 @@ public function getCitation(PKPRequest $request, Submission $submission, string
                             ->all();
 
         $citationData = new stdClass();
+        $citationData->language = str_replace('_', '-', (string) ($publication->getData('locale') ?: $context->getPrimaryLocale()));
 
         if ($this->isArticle) {
             $citationData->type = ($this->application === 'ojs2' ? 'article-journal' : 'article');