Using a normal "build" step > "Trigger/call builds on other projects"
and "Predefined Generator parametes" then the parameters are not resolved
correctly.
For example if I use "LANGUAGE" as generator parameter and set it to EN the
generated job will be "${LANGUAGE}_C" using "${LANGUAGE}_C" as "Generated
Job Name". Expected name is "EN_C".

Using "File Generator Parameter Factory" also resulted in one "${LANGUAGE}_C" job.

See also:
https://groups.google.com/forum/#!searchin/jenkinsci-users/parameter$20factories/jenkinsci-users/MmQFuTuimts/9hEzihMTgAcJ