Add the hability to have a custom licence string in footer

templates/includes/footer.html

@@ -14,9 +14,11 @@
             {%- if CC_LICENSE or CC_LICENSE_DERIVATIVES or CC_LICENSE_COMMERCIAL %}
               {% from 'includes/cc-license.html' import cc_license_mark %}
               <p><small>{{ cc_license_mark(cc_name=CC_LICENSE,derivatives=CC_LICENSE_DERIVATIVES,commercial=CC_LICENSE_COMMERCIAL,attr_markup=CC_ATTR_MARKUP,attr_props={'title':SITENAME,'name':article.author if article else AUTHOR,'url':SITEURL}) }}</small></p>
+            {% elif CUSTOM_LICENSE %}
+              <p><small>{{ CUSTOM_LICENSE }}</small></p>
             {% endif %}
          </div>
          <div class="col-xs-2"><p class="pull-right"><i class="fa fa-arrow-up"></i> <a href="#">Back to top</a></p></div>
       </div>
    </div>
-</footer>
\ No newline at end of file
+</footer>