Given the audience here, the information may be considered interesting. For example, if I'm interested in VPN technology and want to build this, read some code

Given the audience here, the information may be considered interesting. For example, if I'm interested in VPN technology and want to build this, read some code or contribute to it, the language used may be a deciding factor. As a user, it may not matter, but in this case the link is to a Github repo with 0 releases sent to a community of people who are probably more likely than average to be interested in the technical details. In that sense the question may rather be what makes JavaScript so special that it needn't be mentioned. After all, to even run it I need a special runtime environment (e.g. nodejs or a javascript enabled browser).