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Update according to description in http://go/cros-input-methods-naming.
Also update Bangali to Bangla and Myanmar to Burmese/Myanmar

Bug: 889763
Change-Id: I53bf124a52c8064e3ab11d2b1a3b022559b7ba06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551897
Commit-Queue: My Nguyen <myy@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830089}