docs: fix press category locale

docs/pages/dev/index.md

@@ -1,6 +1,6 @@
 ---
 title: Participate in Development
-title_zh: 参与开发
+title_zh-CN: 参与开发
 categories:
   - dev
 end: false

packages/valaxy-theme-press/components/PressCategory.vue

@@ -22,9 +22,9 @@ const collapsable = ref(props.collapsable)
 const { t, locale } = useI18n()
 
 function getTitle(post: Post | any) {
-  let lang = locale.value
-  lang = lang === 'zh-CN' ? 'zh' : lang
-  return post[`title_${lang}`] ? post[`title_${lang}`] : post.title
+  const lang = locale.value
+  const localeTitle = post[`title_${lang}`] || post[`title_${lang.split('-')[0]}`]
+  return localeTitle || post.title
 }
 </script>