language: update IANA entries

Required larger size for region group bitmasks.

Change-Id: I8e58c359d3ee0221477994425b35519c5a8ef843
Reviewed-on: https://go-review.googlesource.com/55751
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
3 files changed