I have seen OS projects use the word "libre" in English before to distinguish between "free as in beer" and "free as in speech" uses of the word. But I can't remember which projects I've seen using that.
Sure sure, and Omelette, but once the word hits everyday usage it starts to feel different. There is a awkwardness hump to get through - and libre has a large one. So I feel it'll never catch on unfortunately
It already caught on once. It's already in the dictionary (though OED suggests it is obsolete). Though English was probably much closer to the Norman/French influence then. It may be the Tudor influence on unifying England under a common language was what killed the historic use of libre.