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Fix l10n by no longer appending strings programmatically.

R=emaxx

      (e.g. smartcard), enter wrong PIN.

Bug: 1023360
Test: Enable RTL language, attempt to log in with PIN dialog
Change-Id: I9d4ffd3d1acef532d4899ef95a99d31af6fb682e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926483Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@google.com>
Cr-Commit-Position: refs/heads/master@{#720907}