Added delaying/advancing subtitles with voice

[aktur]

Now you can delay/advance through Alexa. Default delay is 500ms ("delay/advance subtitles") or you can say "delay/advance subtitles by two seconds". Works better for me than using +/- on remotes as it is not consistent which one delays and which one advances subtitles. With voice its easier and consistent.

[m0ngr31]

Can @ausweider take a look at translating this?

[danielmasur]

Waiting for your Flask-Ask pip10 compatibility patch to be merged. Don't know how to re-setup my device environment without it/manually applying that fix myself.