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[InputMethodNames] Update string description

These names are shown in both tray menu and settings page.
No point in repeating exactly what the string shows.
Cleaning up strings description in preparation for names update
in http://go/cros-input-methods following
http://go/cros-input-methods-naming proposal

Bug: 889763
Change-Id: Ic84230fbf0dab71c8e470643ca24706c2ce943d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518303
Commit-Queue: My Nguyen <myy@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823838}