A system's security comes from the security of its components and their interactions. The functionality of each will be expressed in a language. That language will have features that affect the security of that component. Therefore, security is a component of languages and systems.
I'll go further to say language security is a subset or component of securing a system wherever it could be applied. This has been known since at least MULTIC's where the choice of PL/0 dodged some security vulnerabilities due to language's attributes. It's been known for reliability at least since Burroughs used ALGOL variant for their OS.
Well not exactly
See the modula 3 based research operating systems that solve some of the modularity / performance / security trade off triangle issues of a micro kernel