Address suggestions from code review in #8237

Author: abravalheri

readthedocs/api/v2/templates/restapi/footer.html

@@ -42,7 +42,7 @@
         <dt>{% trans "Versions" %}</dt>
         {% for version in versions %}
         <dd {% if version == current_version %} class="rtd-current-item" {% endif %}>
-          <a href="{{ version.get_subdomain_url }}{{ path|default_if_none:"" }}">{{ version.explicit_name }}</a>
+          <a href="{{ version.get_subdomain_url }}{{ path|default_if_none:"" }}">{{ version.verbose_name }}</a>
         </dd>
         {% endfor %}
       </dl>

readthedocs/builds/models.py

@@ -206,17 +206,16 @@ def explicit_name(self):
         For example, if a version originates from GitHub pull request #4, then
         ``version.explicit_name == "#4 (PR)"``.
 
-        On the other hand, Versions associated with regular ReadTheDocs builds
+        On the other hand, Versions associated with regular RTD builds
         (e.g. new tags or branches), simply return :obj:`~.verbose_name`.
         This means that a regular git tag named **v4** will correspond to
         ``version.explicit_name == "v4"``.
         """
-        external_origin = external_version_name(self)
-
-        if not external_origin:
+        if not self.is_external:
             return self.verbose_name
 
         template = '#{name} ({abbrev})'
+        external_origin = external_version_name(self)
         abbrev = ''.join(word[0].upper() for word in external_origin.split())
         return template.format(name=self.verbose_name, abbrev=abbrev)