Adapt Tor Browser bundling to new HTTPS-Everywhere ID beginning with 5.1.0
The new AMO signing requires changes to the way we bundle HTTPS-Everyhwere. The good thing is if we use the tags as we did everything is fine signature- and version-wise. The bad thing is the EFF needed to change the ID of the self-hosted HTTPS-Everywhere version due to conflicts on the AMO dashboard.
The other change although orthogonal to the AMO signing is moving to a submodule for the translations. We should verify that our build process picks this up.