added new default layout

Author: fpacenza

_layouts/default.html

@@ -16,7 +16,7 @@ <h2 class="project-tagline">{{ site.description | default: site.github.project_t
       {% if site.github.is_project_page %}
         <a href="{{ site.github.repository_url }}" class="btn" target="_blank">View on GitHub</a>
         <a href="https://github.com/DeMaCS-UNICAL/I-DLV/releases" class="btn" target="_blank">Releases</a>
-        <a href="https://github.com/DeMaCS-UNICAL/I-DLV/releases/tag/1.1.7-beta" class="btn" target="_blank">Beta Release (Rational)</a>
+        <a href="https://github.com/DeMaCS-UNICAL/I-DLV/releases/tag/1.1.7-beta" class="btn" target="_blank">Latest Release with Rational Terms</a>
       {% endif %}
     </section>