Before trying this make sure you back up your wiki, otherwise if it breaks 
you would lose everything.

I am not sure if you want all tiddlers with the prefix 'Book' to be changed 
to 'Article' or just some subset of them. I am going to assume all of them.

Try this button:

<$button>Magical Button of Magic
<$list filter='[prefix[Book:]]' variable=OriginalTiddler>
<$list filter='[<OriginalTiddler>removeprefix[Book:]addprefix[Article:]]' 
variable=NewTitle>
<$action-setfield $tiddler=<<OriginalTiddler>> title=<<NewTitle>>/>
<$action-deletetiddler $tiddler=<<OriginalTiddler>>/>
</$list>
</$list>
</$button>

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