Move page date to own file (mmistakes#2544)

Author: lsolesen

_includes/page__date.html

@@ -0,0 +1,5 @@
+{% if page.last_modified_at %}
+  <p class="page__date"><strong><i class="fas fa-fw fa-calendar-alt" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].date_label | default: "Updated:" }}</strong> <time datetime="{{ page.last_modified_at | date: "%Y-%m-%d" }}">{{ page.last_modified_at | date: "%B %-d, %Y" }}</time></p>
+{% elsif page.date %}
+  <p class="page__date"><strong><i class="fas fa-fw fa-calendar-alt" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].date_label | default: "Updated:" }}</strong> <time datetime="{{ page.date | date_to_xmlschema }}">{{ page.date | date: "%B %-d, %Y" }}</time></p>
+{% endif %}

_layouts/single.html

@@ -51,11 +51,7 @@
           <h4 class="page__meta-title">{{ site.data.ui-text[site.locale].meta_label }}</h4>
         {% endif %}
         {% include page__taxonomy.html %}
-        {% if page.last_modified_at %}
-          <p class="page__date"><strong><i class="fas fa-fw fa-calendar-alt" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].date_label | default: "Updated:" }}</strong> <time datetime="{{ page.last_modified_at | date: "%Y-%m-%d" }}">{{ page.last_modified_at | date: "%B %-d, %Y" }}</time></p>
-        {% elsif page.date %}
-          <p class="page__date"><strong><i class="fas fa-fw fa-calendar-alt" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].date_label | default: "Updated:" }}</strong> <time datetime="{{ page.date | date_to_xmlschema }}">{{ page.date | date: "%B %-d, %Y" }}</time></p>
-        {% endif %}
+        {% include page__date.html %}
       </footer>
 
       {% if page.share %}{% include social-share.html %}{% endif %}