[views] Always generate HTTPS URLs if the instance supports said protocol

Closes #4491860

views.py

@@ -102,7 +102,7 @@ See you soon on %(base_url)s !
         data.setdefault(qname('surname'), '')
         if not (data.get(qname('firstname')) or data.get(qname('surname'))):
             data[qname('firstname')] = data[qname('login')]
-        data.update({'base_url': self._cw.vreg.config['base-url'],
+        data.update({'base_url': self._cw.base_url(secure=True),
                      'url': activationurl})
         content = self._cw._(self.content) % data
         subject = self._cw._(self.subject) % data
@@ -112,7 +112,7 @@ See you soon on %(base_url)s !
     def activation_url(self, data):
         data.pop(qname('upassword') + '-confirm', None)
         key = crypto.encrypt(data, self._cw.vreg.config['registration-cypher-seed'])
-        return self._cw.build_url('registration_confirm', key=key)
+        return self._cw.build_url('registration_confirm', key=key, __secure__=True)
 
     def success_redirect_url(self):
         msg = self._cw._(u'Your registration email has been sent. Follow '