Help needed for : Weather CommonID Rule from Wiki with OH2

the rule from the wiki to change the commonid from EN to DE does not work for me. I use OpenHAB2

To translate the commonID to german using the supplied MAP file use the following command in the rule:

var String wetter = transform(“MAP”,“”,wuToday.state.toString)
Important: The input variable has to be of type String!

result for me:
07:31:51.576 [ERROR] [.script.engine.ScriptExecutionThread] - Error during the execution of rule ‘Inline Information’: The name ‘transform(,)’ cannot be resolved to an item or type.

so it seems like it expects “transform” itself is an item and not a command?
Is that oh2 related?