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This CL replaces UI strings of Night Light and Rotation Lock buttons in
UnifiedSystemTray.

TEST=manual
BUG=813499

Change-Id: Ibd191ef921e2e4041a83891c4fb4124110655f7d
Reviewed-on: https://chromium-review.googlesource.com/1102221Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567566}