[AEM6.5] Customize Dynamic Media Video Subtitle and Audio track Tab

Hi Team,

I am serving video through dynamic media, and I want to customize one of the OOB “Subtitles & Audio tracks” Tab, when you upload a video There is an option comes where we can upload the subtitle and Audio tracks, 
I want to rename the Tab “Subtitles & Audio tracks” → “Video Details”

And let suppose if we upload a subtitle’s then I can customize the Language dropdown -

example: If I want to keep only few in dropdown
 

So can anyone please guide me ​​​​​​​

1- How can I Rename the Subtitles & Audio tracks  to→ Video Details

2- I want to provide only specific language under language dropdown.

Thanks

​@kautuk_sahni  ​@arunpatidar  ​@lukasz-m  ​@BrianKasingli