revert nav stuff

_data/navigation.yml

@@ -2,7 +2,7 @@
 # see https://github.com/Plailect/Guide/tree/l10n/_pages for locale codes
 # each language should be separated by a blank line
 
-en_US:
+main:
   - title: "FAQ"
     url: /faq
   - title: "Troubleshooting"

_includes/masthead.html

@@ -4,7 +4,7 @@
       <nav id="site-nav" class="greedy-nav">
         <ul class="visible-links">
           <li class="masthead__menu-item masthead__menu-item--lg"><a href="{{ '/' | absolute_url }}">{{ site.title }}</a></li>
-          {% for link in site.data.navigation.en_US %}
+          {% for link in site.data.navigation.main %}
             {% if link.url contains 'http' %}
               {% assign domain = '' %}
             {% else %}