No longer map zh_TW language to zh language code in dev translations.

.changelog/20260721132553_ck_10480.md

@@ -0,0 +1,15 @@
+---
+type: Major breaking change
+scope:
+  - ckeditor5-dev-translations
+see:
+  - https://github.com/ckeditor/ckeditor5-commercial/issues/10480
+---
+
+The `zh_CN` and `zh_TW` locale codes have been replaced with `zh_Hans` and `zh_Hant`, respectively, to correctly represent Simplified and Traditional Chinese as script variants instead of country/region variants.
+
+As a result:
+
+* The `zh_TW` language code is no longer mapped to the `zh.po` file. It now emits `zh-hant.po` instead.
+* The `zh_CN` language code now emits `zh-hans.po` instead of `zh-cn.po`.
+* The `languageCode` for these locales changed from `zh` (for both) to `zh-Hans` and `zh-Hant`, respectively.

packages/ckeditor5-dev-translations/lib/utils/getlanguages.js

@@ -17,8 +17,8 @@ const SUPPORTED_LOCALES = [
 	'bs', // Bosnian
 	'bg', // Bulgarian
 	'ca', // Catalan
-	'zh_CN', // Chinese (China)
-	'zh_TW', // Chinese (Taiwan)
+	'zh_Hans', // Chinese (Simplified)
+	'zh_Hant', // Chinese (Traditional)
 	'hr', // Croatian
 	'cs', // Czech
 	'da', // Danish
@@ -78,20 +78,23 @@ const SUPPORTED_LOCALES = [
 	'uz', // Uzbek
 	'vi' // Vietnamese
 ];
-
 const LOCALES_FILENAME_MAP = {
 	'ne_NP': 'ne',
 	'si_LK': 'si',
-	'sr@latin': 'sr-latn',
-	'zh_TW': 'zh'
+	'sr@latin': 'sr-latn'
+};
+
+const LOCALES_LANGUAGE_CODE_MAP = {
+	'zh_Hans': 'zh-Hans',
+	'zh_Hant': 'zh-Hant'
 };
 
 /**
  * @returns {Array.<Language>}
  */
 export default function getLanguages() {
 	return SUPPORTED_LOCALES.map( localeCode => {
-		const languageCode = localeCode.split( /[-_@]/ )[ 0 ];
+		const languageCode = LOCALES_LANGUAGE_CODE_MAP[ localeCode ] || localeCode.split( /[-_@]/ )[ 0 ];
 		const languageFileName = LOCALES_FILENAME_MAP[ localeCode ] || localeCode.toLowerCase().replace( /[^a-z0-9]+/, '-' );
 
 		return {

packages/ckeditor5-dev-translations/tests/utils/getlanguages.js

@@ -62,7 +62,7 @@ describe( 'getLanguages()', () => {
 		expect( languageChineseTaiwan ).toEqual( {
 			localeCode: 'zh_TW',
 			languageCode: 'zh',
-			languageFileName: 'zh'
+			languageFileName: 'zh-tw'
 		} );
 	} );
 } );