Click the three dots next to the subtitles you'd like to download
Download the video by clicking the three dots.
In HandBrake, Open the video you downloaded.
Click Subtitles, then Tracks, Add external SRT...
Navigate to the subtitle file you downloaded earlier.
Change the subtitle options to burned in, and SRT Encoding to UTF-7
Click start to encode the video. It should be pretty quick
Preview your final video to ensure the subtitles look correct.