The addon ignores the preferred subtitle language in the Kodi preferences.

*I'm submitting a ...*
- [ ] bug report
- [x] feature request
- [ ] support request

## General information

### Prerequisites

* [x] Are you running the latest version?
Yes.

### Description

I have set the preferred subtitle language to Spanish in the Kodi preferences. However every time I play a movie or an episode of a TV show with the netflix addon the subtitles are disabled, so I have to enable them and also select the Spanish track.

### Steps to Reproduce

1. Set Spanish as preferred subtitle language to Spanish in the Kodi preferences
2. Play a video with the netflix addon

**Expected behavior:** [What you expected to happen]

Subtitles should be enabled and the track selected to Spanish for all movies and TV shows.

**Actual behavior:** [What actually happened]

The video plays without subtitles.

## Context (Environment)

### Installation

* [ ] I installed the plugin via zip from the Releases page
* [x] I´m using the Netflix Repo
* [ ] I´m using a different source (Please tell which)

### Operating System

* [ ] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [x] Windows (x86/x64)
* [ ] Linux (ARM)
* [ ] Android

#### Additional informatin on the environment

Using Windows 10.
It happens also on Android TV.

Start by reproducing the issue in the Kodi preferences and the Netflix addon using the listed Windows 10 or Android TV environments. Trace how the addon starts playback and handles the preferred subtitle language; done means Spanish subtitles are enabled and selected automatically for movies and TV episodes.

Written by the indexing model from the issue text.