* Changed license for language files to the MIT license. I don't think it'll hurt Wedge much if these files find themselves in the wild; anything in Wedge that's NOT a language file is still under the Wedge license, so don't get it wrong! Also added the DCO to the repo, and changed copyright to add contributors. (DCO, LICENSE, README)

@ The main goal is to allow more freedom to translators, and allow them to 'forget' to sign-off their commits. I would still recommend signing them off, until we get some proper legal advice on this.

Signed-off-by: Nao <nao@wedge>