managing comments will damage comment content in UTF-8 on status change

[chrismade]

repro: when global settings are set to comment moderation - and change from "moderated" to "approve" and vice versa thru the authoring interface will rewrite the comment If comment was UTF-8 before then it is rewritten in ISO 8859-1 - which appears strange in an output which expects UTF-8

BTW: commentor's name - which may also contain UTF-8 characters - is NOT effected