adapted the expression translator

...a/de/tla2b/exceptions/ExpressionTranslationException.java

src/main/java/de/tla2b/global/OperatorTypes.java

src/main/java/de/tla2b/output/ASTPrettyPrinter.java

src/main/java/de/tla2bAst/BAstCreator.java

src/main/java/de/tla2bAst/ExpressionTranslator.java

src/main/java/de/tla2bAst/Translator.java

src/test/java/de/tla2b/expression/ComplexExpressionTest.java

src/test/java/de/tla2b/expression/SimpleExpressionTest.java

src/test/java/de/tla2b/expression/TestError.java

src/test/java/de/tla2b/expression/TestKeywords.java

src/test/java/de/tla2b/prettyprintb/BBuiltInsTest.java