Fix language navigation

Author: awvwgk

pages/_templates/sbt-sidebar-footer.html

@@ -0,0 +1,18 @@
+<p align="center">
+  <div class="navbar_extra_footer">
+    <div class="sd-fs-6">
+    ·
+    {%- for lang in ('zh_CN', 'de', 'en', 'es', ) %}
+      {%- if lang == language %}
+      <b>{{lang.lower()[-2:]}}</b>
+      {%- else %}
+      <a href="{{pathto("../"+lang+"/"+pagename)}}">{{lang.lower()[-2:]}}</a>
+      {%- endif %}
+      ·
+    {%- endfor %}
+    </div>
+    {% if theme_extra_navbar %}
+    {{ theme_extra_navbar }}
+    {% endif %}
+  </div>
+</p>

pages/conf.py

@@ -23,15 +23,6 @@
 locale_dirs = ["../locale/"]
 
 _extra_navbar = """
-<div class="sd-fs-6">
-<a href="../en">en</a>
-·
-<a href="../de">de</a>
-·
-<a href="../zh_CN">cn</a>
-.
-<a href="../es">es</a>
-</div>
 <div class="sd-fs-4">
 <a href="https://fortran-lang.discourse.group/" target="_blank">
     <i class="fab fa-discourse"></i>