Target a new tab when clicking links

templates/index.html

@@ -58,7 +58,7 @@
 
                                 {% if project.buttons_use_group %}<div class="btn-group">{% endif %}
                                     {% for button in project.buttons %}
-                                        <a href="{{ button.url }}" class="btn {{ button.classes }}">{{ button.text }}</a>
+                                        <a href="{{ button.url }}" class="btn {{ button.classes }}" target="_blank">{{ button.text }}</a>
                                     {% endfor %}
                                 {% if project.buttons_use_group %}</div>{% endif %}
                             </div>