refac(front): #18 change umlPuzzle & check text
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rename demanded Identitaet class to Besucher, because Identitaet isn't clear to be understood as Client
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add association from Besucher to Geld
rename demanded Identitaet class to Besucher, because Identitaet isn't clear to be understood as Client
add association from Besucher to Geld