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This CL changes the descriptions of the strings used in personalized
sign-in promos to add more context for the translators.

Bug: b/111761802
Change-Id: If1064ce114f1c7f4998f4afcce4d65b49a0e8629
Reviewed-on: https://chromium-review.googlesource.com/1152976Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578649}