refactoring default language strings; added toString-method
bad commit with gitlab by alex, even without key
bad comment removed
added cascading and fetch type
merged
fixed model issue
removed corrupted content
added cascading and fetch type
added cascading and fetch type
added default constructor for study
added add method for note
removed joinTable-annotations
added default constructor
added default constructor
removed @ElementCollection due to problems with hibernate
removed unused @ElementCollection
added default constructor
n:m-relations in separate tables
@Lob - large object for string properties
refactoring. extracted to separate module