[V3] guild->server (#1529)

Mostly string renames
customcom now recognized {guild} and {server}

redbot/cogs/audio/audio.py

@@ -193,7 +193,7 @@ class Audio:
         status = await self.config.status()
         vote_percent = data['vote_percent']
         msg = ('```ini\n'
-               '----Guild Settings----\n')
+               '----Server Settings----\n')
         if dj_enabled:
             msg += 'DJ Role:          [{}]\n'.format(dj_role_obj.name)
         if jukebox: