Indeed, the right to make copies are often licenced (although you can also sell that right) because it is explicitly written in some conventions (see https://en.wikipedia.org/wiki/Berne_Convention?useskin=vector) that the copyright resides with the creator to begin with. I don’t think the Berne Convention deals with the option of transferring intellectual property and the copyright to them, but I’m assuming it’s mostly defined well enough in some contract law or other.
You can. I’ve reduced my language list down from the default of “every single one”. You should probably still keep “undetermined” selected as a “language”, otherwise a lot of stuff people haven’t actually tagged with a language won’t show up.