add download link; update player and pages layout

aircox/models/sound.py

@@ -42,6 +42,10 @@ class SoundQuerySet(models.QuerySet):
         """ Return sounds available as podcasts """
         return self.filter(is_public=True)
 
+    def downloadable(self):
+        """ Return sounds available as podcasts """
+        return self.filter(is_downloadable=True)
+
     def archive(self):
         """ Return sounds that are archives """
         return self.filter(type=Sound.TYPE_ARCHIVE)
@@ -131,7 +135,8 @@ class Sound(models.Model):
         default=False,
     )
     is_downloadable = models.BooleanField(
-        _('downloadable'), help_text=_('whether it can be publicly downloaded by visitors'),
+        _('downloadable'),
+        help_text=_('whether it can be publicly downloaded by visitors (sound must be public)'),
         default=False,
     )
 
@@ -153,6 +158,8 @@ class Sound(models.Model):
             self.program = self.episode.program
         if check:
             self.check_on_file()
+        if not self.is_public:
+            self.is_downloadable = False
         self.__check_name()
         super().save(*args, **kwargs)