perf(i18n): set the global default locales to "en" (#979)

Avoid missing labels caused by languages ​​outside of locales.

_includes/update-list.html

@@ -4,7 +4,7 @@
 
 {% assign MAX_SIZE = 5 %}
 
-{% assign all_list = "" | split: "" %}
+{% assign all_list = '' | split: '' %}
 
 {% for post in site.posts %}
   {% if post.last_modified_at %}
@@ -17,24 +17,25 @@
 
 {% assign all_list = all_list | sort | reverse %}
 
-{% assign update_list = "" | split: "" %}
+{% assign update_list = '' | split: '' %}
 
-{% for entry in all_list limit:MAX_SIZE %}
+{% for entry in all_list limit: MAX_SIZE %}
   {% assign update_list = update_list | push: entry %}
 {% endfor %}
 
 {% if update_list.size > 0 %}
-
   <div id="access-lastmod" class="post">
-    <div class="panel-heading">{{- site.data.locales[site.lang].panel.lastmod -}}</div>
+    <div class="panel-heading">{{- site.data.locales[include.lang].panel.lastmod -}}</div>
     <ul class="post-content pl-0 pb-1 ml-1 mt-2">
       {% for item in update_list %}
-        {% assign index = item | split: "::" | last | plus: 0 %}
+        {% assign index = item | split: '::' | last | plus: 0 %}
         {% assign post = site.posts[index] %}
         {% assign url = post.url | relative_url %}
-      <li><a href="{{ url }}">{{ post.title }}</a></li>
+        <li>
+          <a href="{{ url }}">{{ post.title }}</a>
+        </li>
       {% endfor %}
     </ul>
-  </div> <!-- #access-lastmod -->
-
+  </div>
+  <!-- #access-lastmod -->
 {% endif %}