removed htmlspecialchars applied in wrong place.

removed htmlspecialchars applied in wrong place.

rewrote message text extraction. Output of formatBody() and translateText()
functions depends on user's preferences and can contain html formating.

removed message text processing code. conversion of html entities applies
only to html special chars and undoes html sanitizing made by charset_decode.
It makes message text unsuitable for form input fields. " -> '' and other
conversions removed too in order to preserve message format.

translate form is displayed only when message body is not empty.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@10994 7612ce4b-ef26-0410-bec9-ea0150e637f0