Well, I don't really know what you mean by "implied noun". What matters is the actual noun used. In French, the names of the languages are always masculine.
- "Le français, l'allemand, le russe, le portugais."
But you're right, "langue" is indeed a feminine noun. If you really want to use a feminine word to talk about a language, you can use "langue" with the appropriate adjective behind : "La langue française."