Pressing Enter in a paragram in ContentTranslation adds <div> tags to the published article.
Such HTML markup is definitely not needed in created pages.
The simple way to handle this would be to convert each paragraph created in this way to a usual wiki syntax paragraph - with two line breaks to separate the paragraphs and without any markup. (Another option would be to add <br /> tags on every line break, but it makes more sense to avoid adding any HTML markup to the wiki syntax of the published article without a specific need.)
(Another issue that it raises is how to move to the next translatable paragraph using keyboard and not mouse, but that's a topic for a separate design task - T109056.)