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Some roles e.g. ignored (found copiously in Android apps) are never meant to be localized. This also enforces a valid message id for any given string and makes it obvious when coming across a missing msg id.

Bug: 934512:
Test: manual
Change-Id: I6ac9650df4f3617836feef3999bfef6d1d58e449
Reviewed-on: https://chromium-review.googlesource.com/c/1478948
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634474}