clean and comments for category templates and php files

src/templates/historique.tpl

@@ -0,0 +1,9 @@
+{include file="admin/_head.tpl" title="%s"|args:$plugin.nom current="plugin_%s"|args:$plugin.id}
+
+{include file="%s_nav.tpl"|args:$plugin_tpl current="index"}
+
+{foreach from=$all_dates item='date'}
+  <p>{$date}</p>
+{/foreach}
+
+{include file="admin/_foot.tpl"}