: upgrade to CLDR 30

The trickiest changes are in language/display where the dropping
of nl-BE as Vlaams in Dutch caused some issues. This will
probably be changed back as I think this change is erroneous, but
as we’re not into the politics of it, we adopt the CLDR changes.

Change-Id: I6c593960778cd4c5b9f0553340b72a1410166506
Reviewed-on: https://go-review.googlesource.com/30910
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
14 files changed