I just mentioned Julia because its where I noticed it, really the issue is a prompt to check all languages that are not mentioned in the switch (only 8 of Geanys 30+, perhaps others should be listed in a comment after the `default:` so its clear their omission is deliberate)
Specifically for Julia, AFAICT multi-line comments are only used for commenting out blocks of code, it uses doc strings like python, so multi-line comments are not used for documentation purposes, so probably ok to omit.