rf-web/_includes/common/lang-selector.html

{% assign posts=site.posts | where:"ref", page.ref | sort: 'lang' %}
{% assign newpages=site.pages | where:"ref", page.ref | sort: 'lang' %}

<div class="nav-group">
    {% if posts.size > 1 %}
        {% for post in posts %}
            {% if post.lang != page.lang %}
                <a href="{{ site.base-url }}{{ post.url }}" class="lang lang--{{ page.lang }}">
                    {% if page.lang == 'en' %}
                        {{ include.fr-text }}
                    {% else %}
                        {{ include.en-text }}
                    {% endif %}
                </a>
            {% endif %}
        {% endfor %}

    {% elsif newpages.size > 1 %}
        {% for pege in newpages %}
            {% if pege.lang != page.lang and page.ref != '' %}
                    {% if page.lang == 'en' %}
                        <a href="{{ pege.url }}" class="lang lang--{{ page.lang }}">{{ include.fr-text }}</a>
                    {% else %}
                        <a href="{{ pege.url }}" class="lang lang--{{ page.lang }}">{{ include.en-text }} </a>
                    {% endif %}
            {% endif %}
        {% endfor %}


    {% elsif page.lang == 'en' %}
        <a href="{{ site.baseurl }}/fr" class="lang lang--{{ page.lang }}">{{ include.fr-text }}</a>
        <span class="poop">{{ site.data.menu[page.ref]}}</span>
    {% else %}
        <a href="{{ site.baseurl }}/" class="lang lang--{{ page.lang }}">{{ include.en-text }} </a>
        <span class="poop">{{ site.data.menu[page.ref]}}</span>
    {% endif %}
</div>