I get this error when trying to enter an English translation for the title of a Portuguese film: "It seems as though you are entering text in Portuguese while browsing in English.”
Here’s the link.
The only text we validate is the overview so the language checker thinks whatever is entered isn't English. If it isn't English ( doesn't look like it is) you will have translate it first. I usually stick it in Google Translate for these cases.
Ah cheers, that will help in sorting it out.