made the abstract ( Zusammenfassung ) from type t.string to Type t.text

t.string gets converted do the database type nvarchar(255) this means the abstract can only hold 256 characters  int theory ( 128 in reality don't know why )
t.text creates nvarchar(max) which is 2^31 - 1 byte -> 2GigaByte -> 2Giga Characters -> "unlimited" abstract length