reverso.el: Emacs client for reverso.net; translation, grammar check, context and synonyms search

Hey r/emacs! I've made an Emacs client for a service called [Reverso](https://www.reverso.net/). It offers some translation-related services that I thought would be nice to use inside Emacs... uh, as long as the reverse-engineered API holds. But there's at least one active project that reverse-engineers the same API.