[Playback] Wrong playback language

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

## General information
I am running:
Linux osmc2 4.9.29-9-osmc #1 SMP PREEMPT Sat Jul 29 01:44:42 UTC 2017 armv7l GNU/Linux
Kodi18 from http://download.osmc.tv/dev/gmc-18 (latest)
Netflix plugin 0.12.4

### Prerequisites

* [X] Are you running the latest version?

### Description

[Description of the bug or feature]
Some shows play in German although my base language is English and English is available. For example the last episode of Star-Trek: Enterprise
### Steps to Reproduce

1. Start Kodi
2. Log on to Netflix
3. Navigate to the Netflix Star-Trek folder and the last show of season 4 (the very last one)

**Expected behaviour:** [What you expected to happen]
I expected the show to play in English

**Actual behaviour:** [What actually happened]
The show played in German.
Language re-selection was possible and worked fine.

## 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)
* [ ] Windows (x86/x64)
* [X] Linux (ARM)
* [ ] Android

#### Additional information on the environment

[Describe your environment a bit more detailed, are you using LibreElec f.e.]

## Debug log

[Please include a link to your debug log (use something like [http://sprunge.us/](http://sprunge.us/)) or similar, please do not paste]

http://sprunge.us/YGVf