Please copy the subtitle file for your language then rename its name to the exact name of the video.
Default is Dutch.
Always keep the backup folder. 
To create subtitles for more languages you can use the following tools:

https://subtitlestranslator.com/
or 
https://www.syedgakbar.com/projects/dst

Or search for your own "subtitle translator"
Knowledge is power and power should be shared.
Sharing is Caring. 
Please share this important documentary. It is crucial information in my opinion...

Peace Bernie :)