Twins page bug fixes

- Prevent overwriting of `council` context variable, which was
  causing the incorrect page title to be output.
- Swap council names in empty state messages.

caps/templates/caps/twins.html

@@ -83,7 +83,7 @@ <h2>{{ council.short_name }}’s climate plans</h2>
                     </ul>
                   {% else %}
                     <p class="px-3 mb-0 text-muted">
-                        (No terms appear in just {{ twin.short_name }}’s plans.)
+                        (No terms appear in just {{ council.short_name }}’s plans.)
                     </p>
                   {% endif %}
                     </ul>
@@ -144,7 +144,7 @@ <h2>{{ twin.short_name }}’s climate plans</h2>
                     </ul>
                   {% else %}
                     <p class="px-3 mb-0 text-muted">
-                        (No terms appear in just {{ council.short_name }}’s plans.)
+                        (No terms appear in just {{ twin.short_name }}’s plans.)
                     </p>
                   {% endif %}
                   {% if twin.plan_overlap.overlap %}
@@ -173,7 +173,7 @@ <h2>{{ twin.short_name }}’s climate plans</h2>
                 </div>
               {% else %}
                 <div class="card-body">
-                    <p>We haven’t found any climate plans or documents for <a href="{% url 'council' council.slug %}">{{ council.name }}</a>. If you know where to find them, <a href="{{ council.feedback_form_url }}">please let us know</a>.</p>
+                    <p>We haven’t found any climate plans or documents for <a href="{% url 'council' twin.slug %}">{{ twin.name }}</a>. If you know where to find them, <a href="{{ twin.feedback_form_url }}">please let us know</a>.</p>
                 </div>
               {% endif %}
             </div>

caps/views.py

@@ -498,8 +498,8 @@ def get_context_data(self, **kwargs):
                 council.related_council_keyphrase_intersection()
             )
             for group in related_councils:
-                for council in group["councils"]:
-                    council.plan_overlap = related_councils_intersection[council]
+                for c in group["councils"]:
+                    c.plan_overlap = related_councils_intersection[c]
                 if group["type"].slug == "composite":
                     twin = group["councils"][0]
                     context["twin"] = twin