🐛 fix: fix changelog locale not showing English (lobehub#5607)

Author: arvinxx

src/server/services/changelog/index.ts

@@ -76,7 +76,7 @@ export class ChangelogService {
     try {
       const post = await this.getIndexItemById(id);
 
-      const filename = options?.locale === 'en-US' ? `${id}.mdx` : `${id}.zh-CN.mdx`;
+      const filename = options?.locale?.startsWith('zh') ? `${id}.zh-CN.mdx` : `${id}.mdx`;
       const url = this.genUrl(urlJoin(this.config.docsPath, filename));
 
       const response = await fetch(url);