: upgrade to CLDR 31

- fixes some tests related to Swiss group separator
- added some manual patches to fix language matcher
- generate new tables for language matcher (not
   all used yet)

Change-Id: I42961cda4d81b302c7d31690507b8d9ea85a0ed2
Reviewed-on: https://go-review.googlesource.com/46852
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>