Fixed the label retrieval

dbrepo-authentication-service/dbrepo-realm.json

...uwien/api/database/table/columns/concepts/ConceptDto.java

...n/api/database/table/columns/concepts/ConceptSaveDto.java

...t/tuwien/api/database/table/columns/concepts/UnitDto.java

...wien/api/database/table/columns/concepts/UnitSaveDto.java

.../api/src/main/java/at/tuwien/api/semantics/EntityDto.java

...in/java/at/tuwien/api/semantics/TableColumnEntityDto.java

...n/entities/database/table/columns/TableColumnConcept.java

...wien/entities/database/table/columns/TableColumnUnit.java

dbrepo-metadata-db/setup-schema.sql

.../src/main/java/at/tuwien/endpoints/SemanticsEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/TableEndpoint.java

...rvices/src/main/java/at/tuwien/mapper/OntologyMapper.java

...rc/main/java/at/tuwien/service/impl/QueryServiceImpl.java

...main/java/at/tuwien/service/impl/SemanticServiceImpl.java

...rc/main/java/at/tuwien/service/impl/TableServiceImpl.java

...rc/main/java/at/tuwien/endpoints/TableColumnEndpoint.java

.../java/at/tuwien/endpoint/TableColumnEndpointUnitTest.java

.../at/tuwien/exception/SemanticEntityNotFoundException.java

...c/main/java/at/tuwien/gateway/SemanticServiceGateway.java