FIX: class style was break within space-name.

Author: ivan-nginx

layout/_partials/header.swig

@@ -39,7 +39,7 @@
     <ul id="menu" class="menu">
       {% for name, path in theme.menu %}
         {% set itemName = name.toLowerCase() %}
-        <li class="menu-item menu-item-{{ itemName }}">
+        <li class="menu-item menu-item-{{ itemName | replace(' ', '-') }}">
           <a href="{{ url_for(path) }}" rel="section">
             {% if theme.menu_icons.enable %}
               <i class="menu-item-icon fa fa-fw fa-{{theme.menu_icons[itemName] | default('question-circle') | lower }}"></i> <br />