glossa.info/_source/rugbiana/_includes/footer.html

<footer class="site-footer">
  <div style="text-align:center;" class="container">
    {% if page.prev %}
      {% assign prev_link = page.prev | split: '@' %}
      <a href="{{ site.baseurl }}/lessons/{{ page.language }}/{{ page.lang }}/{{ prev_link[1] }}" style="float:left;">← {{ prev_link[0] }}</a>
    {% endif %}

    {% if page.prev or page.next %}
      {% if page.layout == 'vocabulary' or page.type == 'vocabulary' %}
        {% assign index_page = 'vocabulary/' %}

        {% if page.lang == 'ru' %}
          {% assign index_title = 'Словарь' %}
        {% elsif page.lang == 'en' %}
          {% assign index_title = 'Vocabulary' %}
        {% endif %}
      {% else %}
        {% assign index_page = '' %}

        {% if page.lang == 'ru' %}
          {% assign index_title = 'Содержание' %}
        {% elsif page.lang == 'en' %}
          {% assign index_title = 'Table of Contents' %}
        {% endif %}
      {% endif %}

      <a href="{{ site.baseurl }}/lessons/{{ page.language }}/{{ page.lang }}/{{ index_page }}">{{ index_title }}</a>
    {% endif %}

    {% if page.next %}
      {% assign next_link = page.next | split: '@' %}
      <a href="{{ site.baseurl }}/lessons/{{ page.language }}/{{ page.lang }}/{{ next_link[1] }}" style="float:right;">{{ next_link[0] }} →</a>
    {% endif %}
  </div>
  <br />
</footer>