int2enum is not recognized as keyword/predefined function

Summary

int2enum is not recognized as keyword/predefined function

Steps and/or TTCN-3 code to reproduce

write a code containing int2enum

What is the current bug behavior?

it is not highlighted by the editor like the other predefined functions

What is the expected correct behavior?

it should be highlighted like the other predefined functions

Titan version

8.3.0

Platform details (OS type and version)

All

/cc @aknappqwt @mmagyari