fix: utf-8 on feedback and annotation documents

gemeinsamforschen/src/main/webapp/assets/js/createQuiz.js

gemeinsamforschen/src/main/webapp/assets/js/takeQuiz.js

...samforschen/src/main/webapp/pages/annotation-document.jsp

gemeinsamforschen/src/main/webapp/pages/createQuiz.jsp

gemeinsamforschen/src/main/webapp/pages/givefeedback.jsp

gemeinsamforschen/src/main/webapp/pages/project-student.jsp

gemeinsamforschen/src/main/webapp/pages/rateContribution.jsp

gemeinsamforschen/src/main/webapp/pages/takeQuiz.jsp

gemeinsamforschen/src/main/webapp/pages/viewfeedback.jsp