First version

_includes/functions/redirect-page.html

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+{% include /functions/wiki-pages.html %}
+{% assign redirect = page.redirect | default: site.data.i18n[site.lang].home %}
+{% for other_page in wiki_pages %}
+  {% if other_page.slug == redirect %}
+    {% assign redirect_page = other_page %}
+  {% endif %}
+{% endfor %}

_includes/functions/wiki-pages.html

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+{% assign wiki_pages = '' | split: '' %}
+{% for collection in site.collections %}
+  {% assign prefix = collection.label | slice: 0, 4 %}
+  {% if prefix == 'wiki' %}
+	  {% assign wiki_pages = wiki_pages | concat: collection.docs %}
+  {% endif %}
+{% endfor %}