…1250

… fixed single mode when found language is undefined.

This alteration allows the prowl message to link to a user defined url
Such as the imdb page for a movie
```    prowl:
      apikey: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
      event: 'New movie'
      description: '{{title}}'
      url: '{{imdb_url}}'```

Or for the more tech savy a custom page that deals with the torrent
```    prowl:
      apikey: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
      event: 'New movie'
      description: '{{title}}'
      url: 'https://myserver.com/ctrl/{{torrent_info_hash}}'```

[add] Prowl - Allow the sending of the prowl url parameter