Updated language switcher to allow per-page default language selection.

_layouts/default.html

@@ -78,7 +78,8 @@ <h1>{{ page.title }} {% if page.languages %}{% include language-dropdown.html %}
 <script src="{{ site.baseurl }}/js/purl.js" type="text/javascript"></script>
 <script src="{{ site.baseurl }}/js/cookies.min.js" type="text/javascript"></script>
 <script type="text/javascript">
-	var languages = { {% for lang in page.languages %}
+	{% assign default_lang = "ruby" %}
+	var languages = { {% for lang in page.languages %}{% if lang.default %}{% assign default_lang = lang.slug %}{% endif %}
 		'{{ lang.slug }}': '{{ lang.name }}'{% unless forloop.last %},{% endunless %}{% endfor %}
 	};
 </script>
@@ -94,11 +95,11 @@ <h1>{{ page.title }} {% if page.languages %}{% include language-dropdown.html %}
         desiredLanguage = localStorage.getItem('desired_language');
       }
     } else {
-      desiredLanguage = "ruby";
+  		desiredLanguage = "{{ default_lang }}";
     }
   };
 	if(!validLanguage(desiredLanguage)) {
-		switchLanguage("ruby", false);
+		switchLanguage("{{ default_lang }}", false);
 	} else {
 	  switchLanguage(desiredLanguage);
 	}