Support all natural languages which Gherkin provides

[gnuechtel]

1. General summary of the issue

Pester should also execute all non-English feature files.

2. Describe Your Environment

Pester version     : 4.4.3 D:\Documents\WindowsPowerShell\Modules\Pester\Pester.psm1
PowerShell version : 5.1.15063.1446
OS version         : Microsoft Windows NT 10.0.15063.0

3. Expected Behavior

If Pester executes an non-English feature file, it should just work

4.Current Behavior

If Pester executes a German feature file for example, the following output occurs:

WARNING: Unexpected Feature Child: Szenario
WARNING: Unexpected Feature Child: Szenariogrundriss

And more following errors ...

5. Possible Solution

Pull Request will be provided very soon.

[fourpastmidnight]

I deleted my comments here, because they belonged on the Pull Request. Sorry, but I had a browser tab mix up.