bugfixing: fixed small errors in annotation module

...c/main/java/unipotsdam/gf/config/GFApplicationBinder.java

...chen/src/main/java/unipotsdam/gf/interfaces/Feedback.java

...n/src/main/java/unipotsdam/gf/interfaces/IAnnotation.java

...n/src/main/java/unipotsdam/gf/interfaces/ISubmission.java

...f/modules/annotation/controller/AnnotationController.java

...va/unipotsdam/gf/modules/annotation/model/Annotation.java

...otsdam/gf/modules/annotation/model/AnnotationMessage.java

...am/gf/modules/annotation/model/AnnotationPostRequest.java

...potsdam/gf/modules/annotation/view/AnnotationService.java

...m/gf/modules/annotation/websocket/AnnotationWSTarget.java

...les/annotation/websocket/AnnotationWebSocketEndpoint.java

...rc/main/java/unipotsdam/gf/modules/feedback/Category.java

...f/modules/feedback/Controller/PeerFeedbackController.java

...in/java/unipotsdam/gf/modules/feedback/DummyFeedback.java

...ain/java/unipotsdam/gf/modules/feedback/FeedbackImpl.java

...ipotsdam/gf/modules/feedback/Model/Peer2PeerFeedback.java

...unipotsdam/gf/modules/feedback/View/PeerFeedbackView.java

...ain/java/unipotsdam/gf/modules/journal/model/Journal.java

...java/unipotsdam/gf/modules/journal/util/JournalUtils.java

...dam/gf/modules/peer2peerfeedback/PeerFeedbackService.java