Hello,
Thank you very much for choosing our theme and for contacting us.
You can remove the Loco plugin and translations would remain.
Here is a video tutorial that should help you translate your website texts with a Loco Translate plugin 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 to ensure the translations after each theme update.
Best Regards