Fix card link

Author: StanFromIreland

templates/index.html.jinja

@@ -17,8 +17,8 @@
                     <a href="https://docs.python.org/{{ project.language.code }}/3/" style="color: #1595fe;">View</a>
                     •
                   {% endif %}
-                  {% if project.translators.link %}
-                    <a href="{{ project.translators.link }}" style="color: #1595fe;">Contribute</a>
+                  {% if project.contribution_link %}
+                    <a href="{{ project.contribution_link }}" style="color: #1595fe;">Contribute</a>
                   {% elif project.uses_platform %}
                     <a href="https://app.transifex.com/join/?o=python-doc&p=python-newest&t=opensource" style="color: #1595fe;">Contribute</a>
                   {% else %}