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The wording on the message descriptions was incorrect,
suggesting the text is "readable" when it should have
indicated that the text will be read by a screenreader.

Change-Id: Ide5ae94e938d1690f4adec639484815aaeeddf5e
Reviewed-on: https://chromium-review.googlesource.com/1124800
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572401}