fix bug in third person question

replace all occurences of {playername} in third person questions

frontend/src/gamelogic.ts

@@ -339,6 +339,6 @@ function shuffle(a: any[]) {
 }
 export function selectQuestionText(question: Question, thirdPerson: boolean, playerName: string) {
     var questionString = (thirdPerson ? question.questionThirdPerson : undefined) ?? question.question;
-    questionString = questionString.replace("{playerName}", playerName);
+    questionString = questionString.replace(/{playerName}/g, playerName);
     return questionString;
 }