fix(editor): Fix i18n package locale files hot reloading (no-changelog) (#19385)

Co-authored-by: Csaba Tuncsik <csaba.tuncsik@gmail.com>

packages/frontend/editor-ui/vite/i18n-locales-hmr-helpers.ts

@@ -0,0 +1,19 @@
+import { sep as pathSep } from 'path';
+
+export const isLocaleFile = (file: string): boolean =>
+	file.endsWith('.json') && file.includes(`${pathSep}locales${pathSep}`);
+
+export const extractLocale = (file: string): string | null => {
+	const match = file.match(new RegExp(`${pathSep}locales${pathSep}([^${pathSep}]+)\\.json$`));
+	return match?.[1] ?? null;
+};
+
+export const sendLocaleUpdate = (server: any, file: string): void => {
+	if (!isLocaleFile(file)) return;
+	const locale = extractLocale(file);
+	server.ws.send({
+		type: 'custom',
+		event: 'n8n:locale-update',
+		data: { locales: locale ? [locale] : [], file },
+	});
+};