Hello,
Thank you very much for choosing our theme and for contacting us.
I do hope you have made the backup of the site, if so, restore the site from the backup.
Here is a video tutorial: https://www.youtube.com/watch?v=D3NsDdMzsls&list=PLMw6W4rAaOgKKv0oexGHzpWBg1imvrval&index=3
Please check the video tutorial to see how to save the translation file correctly. Then update the theme.
If you do not have a backup, try to contact the host support, perhaps there is an automatic site backup.
Best Regards