Full course request refactor and translation
Changes to be committed:
	modified:   school-service/src/main/java/school/service/CourseRequestService.java
	modified:   school-service/src/main/java/school/service/CourseService.java
	modified:   school-service/src/main/java/school/service/GroupService.java
	modified:   school-service/src/main/java/school/service/implementation/CourseRequestServiceImpl.java
	modified:   school-service/src/main/java/school/service/implementation/CourseServiceImpl.java
	modified:   school-service/src/main/java/school/service/implementation/GroupServiceImpl.java
	modified:   school-web/src/main/java/school/controller/CourseRequestController.java
	modified:   school-web/src/main/resources/messages_en.properties
	modified:   school-web/src/main/resources/messages_ru.properties
	modified:   school-web/src/main/resources/messages_ua.properties
	modified:   school-web/src/main/webapp/views/course-request/student.jsp
	modified:   school-web/src/main/webapp/views/course-request/teacher.jsp