Enable localization of geckoview build

This MR fixes #22 (closed) by enabling the multi-locale build of geckoview. It includes every locale listed in l10n-central. For simplicity, I just dumped the locales into a text file alongside the patches. Perhaps @relan or @IratePorcupine have a more clever/programmatic way of getting the available locales directly from mozilla's mercurial repos, in case new ones are added.

I've ran several test builds and have confirmed that it builds successfully and fixes the issue reported in #22 (closed). See the screenshots below show my validations; about:support showing the exhaustive list of available locales, and uBlock origin's configuration translates into español,