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This CL updates descriptions on two Language Settings strings based on
feedback from translators.

Bug: 1133470
Change-Id: I91c27b06104fea6b3bb57a3033aec3cc1136450b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438311
Commit-Queue: Trevor  Perrier <perrier@chromium.org>
Auto-Submit: Trevor  Perrier <perrier@chromium.org>
Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811913}