in the category admin template (edit and add) you must change the name of the textarea content input :
admin_tpl\cat_add_form.html
<textarea name="content-page" cols="40" rows="7"></textarea>
by
<textarea name="content" cols="40" rows="7"></textarea>
admin_tpl\cat_edit_form.html
<textarea name="content-page" cols="40" rows="7"><%$content%></textarea>
by
<textarea name="content" cols="40" rows="7"><%$content%></textarea>


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