fix(NcDateTimePicker): use translated words in dates formatted with a format string

Signed-off-by: Oleksandr Dzhychko <hey@oleks.dev>

Author: odzhychko

build/date-fns-locales-plugin.mts

@@ -0,0 +1,62 @@
+/*!
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: CC0-1.0
+ */
+import type { Plugin } from 'vite'
+
+import { exactRegex } from '@rolldown/pluginutils'
+import { glob } from 'fs/promises'
+import { createRequire } from 'module'
+import { dirname, join } from 'path'
+
+/**
+ * This plugin generates a module that can be used to dynamically load locales from `date-fns`.
+ * It generates it in a way that it works with the externalization of the `date-fns` locales
+ * and with Vite and Webpack apps.
+ *
+ * A plugin is used because Vite's dynamic imports and glob imports cannot generate imports in such a way.
+ */
+export default () => {
+	let localeFiles: string[] = []
+	const virtualModuleId = 'virtual:date-fns-locales'
+	const resolvedVirtualModuleId = '\0' + virtualModuleId
+	return {
+		name: 'date-fns-locales-plugin',
+		enforce: 'pre',
+		async buildStart() {
+			this.info('Collectioning locales in date-fns/locales')
+			const require = createRequire(import.meta.url)
+			const pkgJsonPath = require.resolve('date-fns/package.json')
+			const localeDir = join(dirname(pkgJsonPath), 'locale')
+			localeFiles = await Array.fromAsync(glob('*.js', {
+				cwd: localeDir,
+				exclude: ['types.js', 'en-US.js', 'cdn.js', 'cdn.min.js'],
+			}))
+		},
+		resolveId: {
+			filter: { id: /dateFnsLocaleLoader\.ts$/ },
+			handler() {
+				return resolvedVirtualModuleId
+			},
+		},
+		load: {
+			filter: { id: exactRegex(resolvedVirtualModuleId) },
+			handler() {
+				let content = ''
+				content += 'const loader = {}\n'
+				content += 'export default loader\n'
+				for (const localeFile of localeFiles) {
+					// e.g., "pt-BR.js" -> "pt-BR"
+					const localeCode = localeFile.slice(0, -3)
+					let exportName = localeCode.replaceAll('-', '')
+					// One locale is named inconsistently...
+					if (localeCode === 'be-tarask') {
+						exportName = 'beTarasak'
+					}
+					content += `loader['${localeCode}'] = async () => (await import('date-fns/locale/${localeCode}')).${exportName}\n`
+				}
+				return content
+			},
+		},
+	} as Plugin
+}