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Also add description for the dialog.
Will update search field look later.
Keeping search field's onKeyDown behavior similar to AddLanguagesDialog

Current view: http://screen/89QAGJxXX5Yh2nB
Spec: http://go/cros-lang-settings-ux-slide#slide=15

String is being finalised so translateable=false and no screenshots
required

Bug: 1113439
Change-Id: I8b7e428d42754eaaf91252aa4f23664cdd3690bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379031
Commit-Queue: My Nguyen <myy@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802982}