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This CL replaces UI strings of Bluetooth feature pod button in
UnifiedSystemTray. It also shows the connected device name, and if there
are multiple connected devices, it shows the number.

TEST=manual
BUG=813499

Change-Id: Ic4d840586f2ff490a9c72b19c6679bb3c5c674a6
Reviewed-on: https://chromium-review.googlesource.com/1102225Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567696}