Nowadays GoogleTranslate is way better than it was so it is possible if you have an srt in a language that you do not understand very well to turn it to ENG. All I suggest to use here is LibreOffice GUI and CLI and Google Translate online
I have tested it with a few languages and it gives you a totally workable final product; not perfect obviously but serviceable
Here is how:
Translate foreign lang sub to ENG:
➊ In Terminal >> libreoffice --convert-to “docx” foreignlang.srt
➋ to google translate/Documents >> translate
➌ Download to ENG.docx // open in Libreoffice GUI // copy
➍ Paste in text editor save as ENG.srt
Done