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This CL lands strings for upcoming changes to the dropdown which will
better reflect the source of users' cards.

See also (googlers only):
https://docs.google.com/document/d/18oV-_0QfoWM7rgp-suzDn4WspFNHRPKxI-4epHDQZIg/edit?usp=sharing

Tbr: ftirelo@chromium.org
Bug: 908543
Change-Id: Idec6a806747ad0b49a41bbe4dc4493b13c67604e
Reviewed-on: https://chromium-review.googlesource.com/c/1351498Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611128}