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This CL update the strings for reauth and add user. Follow up CLs will
update the strings for other use cases.

Bug: 921142
Test: unit tests
Change-Id: Ib6c1daa363bdd6e901e1f5842bd274c4b6d85e71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347003
Commit-Queue: Li Lin <llin@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799327}