I cannot find feedback page, so I write here. If irrelevance, please guide to correct page.
Please remove annoying yellow rectangle around multibyte word conversion.
(My language is Japanese)

Rectangle for 2 line overwrapping string is shown between starting charactor and ending charactor,
that does not cover whole converting strings and makes no sense.

This may main reason of preventing multibyte language user from Editorial.
Please use standard style, gray-background strings, like Mail.app.