When you use Google Translate and you open an item, the multi line text fields is cleared. You are also unable to type anything in the multi line text field: every character you type, disappears.
So if you need to store, first disable Google Translate, add the text to the field and leave the item edit.
I was able to reproduce the issue using your detailed report. We deployed a fix, and the text field should now behave properly even when the page is translated. I just tested and it seems to work fine.
Hmm. @Tim Yes: the field is not cleared but also text is no longer translated. So entered text is blocked in some way. I do not know if it is possible to use translate on all text without clearing the field On a single line it worked well before.
@knobel unfortunately, translating the content of the rich text editor is not really feasible and would yield strange results. Think about the underlying data - which would still be in the original language.
What you could do, is to have a calculation field that mirrors the content of your multi text field. That one would be translated without issues - I just tested that.
Glad to hear this worked in the end, and also thanks to @shir for providing this useful insight into working with the checklist field values (objects) in JS.
@bruno.freitas, @HugoSoares - this fix could also be interesting for you, as I remember you reported that the browser translation would clear the multi text field values in the past.