The guts of the "are programming languages copyrightable" question start a long way down. Link: http://www.bailii.org/ew/cases/EWHC/Ch/2013/69.html#para17 .. particularly from point 27 onward where it is stated a computer program is a literary work but a language is not (para 33).
Indeed, para 33 is the real crux, so I'll reproduce the core of it for anyone without the time to dig around:
[..] my provisional view is that a programming language such as the SAS Language is not capable of being a work. A dictionary and a grammar are works which describe a language. Such works record, and thereby fix, the elements of the language they describe: the meanings of its words and its syntax. It does not follow that the language is a work. Rather, the language is the material from which works (including dictionaries and grammars) may be created. The evolutionary or organic aspect of language can be left on one side for the moment, since it is clear that it is possible to create a language from scratch. Even when a language is created from scratch, however, what it amounts to is a system of rules for the generation and recognition of meaningful statements. Programming languages such as the SAS Language are no different in this respect.
Maybe someone could correct me here but my interpretation is that the judge does not really decide whether or not a) a programming language is capable of being a "work" and b) SAS Language is a work, since they are not relevant to the remainder of the case. Indeed, he merely gives the above as his "provisional" view which leaves the gate somewhat open and no precedent set by this specific case.