[theme] automate langage menu

from config file variables

config.toml

@@ -16,6 +16,7 @@ highlight_code = true
 highlight_theme = "base16-ocean-light"
 
 [extra]
+flag = "🇫🇷"
 
 [extra.translations.en]
 base_url = "http://duniter.trentesaux.fr/"

templates/nav.html

@@ -16,9 +16,11 @@
 
   {# --- langage dropdown --- -#}
   <div class="w3-dropdown-hover w3-dropdown-click w3-right">
-    <button class="w3-button" style="font-size: 1.6em; padding: 0 10px;">🇫🇷</button>
+    <button class="w3-button" style="font-size: 1.6em; padding: 0 10px;">{{config.extra.flag}}</button>
     <div class="w3-dropdown-content w3-bar-block w3-light-grey" style="min-width: 29px;">
-      <a href="https://duniter.org/" title="English website" style="font-size: 1.6em; padding: 0 10px;">🇬🇧</a>
+      {%- for ltag,lcfg in config.extra.translations %}
+      <a href="{{lcfg.base_url}}" title="{{ltag}} website" style="font-size: 1.6em; padding: 0 10px;">{{lcfg.flag}}</a>
+      {%- endfor %}
     </div>
   </div>