fix language-not-found issues on repo page with simplified and tradit…

…ional Chinese

The author of github-readme-stats uses the non-standard code "cn" for simplified Chinese, see [here](https://github.com/anuraghazra/github-readme-stats?tab=readme-ov-file#available-locales). While for traditional Chinese the author only provides "zh-tw". The github-readme-stats functions on repo page will break if the user sets the site language to ALL variants of Chinese except for zh-tw. This hack is to make all sub-variants of simplified Chinese fall back to "cn" and all sub-variants of traditional Chinese fall back to "zh-tw".

_includes/repository/repo.liquid

@@ -5,6 +5,20 @@
   {% assign show_owner = true %}
 {% endif %}
 
+{% assign lang = site.active_lang | split: '-' | first %}
+{% if lang == 'pt' %}
+  {% assign lang = site.active_lang %}
+{% endif %}
+{% if lang == 'zh' %}
+  {% assign lang_last = site.active_lang | split: '-' | last %}
+  {% if lang_last == 'cn' or lang_last == 'sg' or lang_last == 'my' or lang_last == 'hans' %}
+    {% assign lang = 'cn' %}
+  {% elsif lang_last == 'tw' or lang_last == 'hk' or lang_last == 'mo' or lang_last == 'hant' %}
+    {% assign lang = 'zh-tw' %}
+  {% endif %}
+{% endif %}
+{% comment %} If you still encounter language-display issues, check the available locale codes in github-readme-stats (different from ISO-639 standard used in your website): https://github.com/anuraghazra/github-readme-stats?tab=readme-ov-file#available-locales {% endcomment %}
+
 {% if site.data.repositories.repo_description_lines_max %}
   {% assign max_lines = site.data.repositories.repo_description_lines_max %}
 {% else %}

_includes/repository/repo_user.liquid

@@ -1,3 +1,17 @@
+{% assign lang = site.active_lang | split: '-' | first %}
+{% if lang == 'pt' %}
+  {% assign lang = site.active_lang %}
+{% endif %}
+{% if lang == 'zh' %}
+  {% assign lang_last = site.active_lang | split: '-' | last %}
+  {% if lang_last == 'cn' or lang_last == 'sg' or lang_last == 'my' or lang_last == 'hans' %}
+    {% assign lang = 'cn' %}
+  {% elsif lang_last == 'tw' or lang_last == 'hk' or lang_last == 'mo' or lang_last == 'hant' %}
+    {% assign lang = 'zh-tw' %}
+  {% endif %}
+{% endif %}
+{% comment %} If you still encounter language-display issues, check the available locale codes in github-readme-stats (different from ISO-639 standard used in your website): https://github.com/anuraghazra/github-readme-stats?tab=readme-ov-file#available-locales {% endcomment %}
+
 <div class="repo p-2 text-center">
   <a href="https://github.com/{{ include.username }}">
     <img