Fix ext-theme tests (#11872)

Matches readthedocs/ext-theme#549


This also needs readthedocs/ext-theme#552

Author: stsewd

readthedocs/organizations/templates/organizations/organization_choose.html

@@ -42,7 +42,7 @@ <h2>{% trans "Choose an organization" %}</h2>
             </div>
             <!-- END organization list -->
           {% else %}
-            <p>{% trans "You aren't currently a member of any organizations." %}</p>
+            <p>{% trans "Your user is not a member of an organization yet." %}</p>
           {% endif %}
       </div>
     </div>

readthedocs/organizations/tests/test_views.py

@@ -462,4 +462,4 @@ def test_choose_organization_edit(self):
         resp = self.client.get(
             reverse("organization_choose", kwargs={"next_name": "organization_edit"})
         )
-        self.assertContains(resp, "You aren't currently a member of any organizations")
+        self.assertContains(resp, "Your user is not a member of an organization yet")