txtfields in detail-views are now filled with input-data +

.../thdeg/grademanager/gui/CourseModificationController.java

...deg/grademanager/gui/CoursesOfStudyDetailsController.java

...rademanager/gui/CoursesOfStudyModificationController.java

src/main/java/de/thdeg/grademanager/gui/Main.java

src/main/java/de/thdeg/grademanager/gui/MainController.java

...a/de/thdeg/grademanager/gui/StudentDetailsController.java

...main/java/de/thdeg/grademanager/model/CoursesOfStudy.java

src/main/java/de/thdeg/grademanager/model/Student.java

...in/java/de/thdeg/grademanager/model/UniversityMember.java

...s/de/thdeg/grademanager/gui/courses-of-study-details.fxml

.../resources/de/thdeg/grademanager/gui/student-details.fxml