Do I understand correct, that the main question is, how to concatenate 
$:/state/project-number with the word "project"?

Should it be one tag or 2?

For concatenation you usually require a macro. Try this

\define projecttags() project $(projectnumber)$

<$set name="projectnumber" value={{$:/state/project-number}}>
<$button>
   <$action-sendmessage
      $message="tm-new-tiddler"
      title={{$:/state/project-number}}
      tags=<<projecttags>>
   />
   New project
</$button>
</$set>


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