Prettify verifier messages

...i/src/main/java/de/unikoblenz/fgbks/base/domain/Name.java

.../fgbks/core/dmn/domain/vdmn/impl/AbstractVDmnElement.java

...blenz/fgbks/core/dmn/domain/vdmn/utils/VDmnFunctions.java

...n/verification/result/VerificationResultEntryElement.java

...bks/core/dmn/verification/verifier/impl/DateVerifier.java

...e/dmn/verification/verifier/impl/EmptyOutputVerifier.java

...re/dmn/verification/verifier/impl/EquivalentVerifier.java

...ore/dmn/verification/verifier/impl/IdenticalVerifier.java

.../verification/verifier/impl/InputValueSyntaxVerifier.java

...erification/verifier/impl/MissingInputColumnVerifier.java

.../verification/verifier/impl/MissingInputDataVerifier.java

...e/dmn/verification/verifier/impl/MissingRuleVerifier.java

...e/dmn/verification/verifier/impl/OverlappingVerifier.java

.../verification/verifier/impl/PartialReductionVerifier.java

...cation/verifier/impl/PredefinedExistingValueVerifier.java

...ication/verifier/impl/PredefinedMissingValueVerifier.java

...e/dmn/verification/verifier/impl/SubsumptionVerifier.java