Fixed broken template

_includes/page-nav.html

@@ -3,7 +3,7 @@
     {% if page.prev_page.title | size < 40 %}
       {% capture PREV_PAGE %}{{ page.prev_page.title}}{% endcapture %}
     {% else %}
-      {% capture PREV_PAGE %}{{ page.prev_page.title | truncate: 37 | append "..."}}{% endcapture %}
+      {% capture PREV_PAGE %}{{ page.prev_page.title | truncate: 37 | append: "..."}}{% endcapture %}
     {% endif %}
     <a id="js-page__nav__prev" class="c-page__nav__prev" href="{{ page.prev_page.url | relative_url }}">
       〈 <span class="u-margin-right-tiny"></span> {{ page.prev_page.title | truncate: 37 }}
@@ -14,7 +14,7 @@
     {% if page.next_page.title | size < 40 %}
       {% capture NEXT_PAGE %}{{ page.next_page.title}}{% endcapture %}
     {% else %}
-      {% capture NEXT_PAGE %}{{ page.next_page.title | truncate: 37 | append "..."}}{% endcapture %}
+      {% capture NEXT_PAGE %}{{ page.next_page.title | truncate: 37 | append: "..."}}{% endcapture %}
     {% endif %}
     <a id="js-page__nav__next" class="c-page__nav__next" href="{{ page.next_page.url | relative_url }}">
       {{ page.next_page.title | truncate: 37 }} <span class="u-margin-right-tiny"></span> 〉