Add strings for mouse settings, touchpad settings, and touchpad/mouse settings.
Add strings for mouse settings, touchpad settings, and touchpad/mouse settings.

BUG=chromium-os:27627
TEST=NONE
Review URL: https://chromiumcodereview.appspot.com/9732009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@127845 0039d316-1c4b-4281-b951-d872f2087c98

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