Jasper Reports: Accessing translated code values

In our reports we commonly have a need to display CodeValue titles, but these are now not accessible in Jasper.

One suggestion is to implement a custom Jasper expression (see https://community.jaspersoft.com/wiki/jaspersoft-studio-expression-editor-how-extend-it-and-contribute-your-own-functions-part-2):

CODEVALUE("CODE_GROUP", field.getSomeCode(), "en")

This expression will fetch the TranslatedCodeValue and return its title.

The selected language to use for the template will eventually be provided by GGCE (another day, another issue).

I don't think we need to provide a .jar for report developers, but we definitely need to have this function available in the runtime when generating reports.