GitLab

The following strings in the user menu
are updated:
 - "Guest" -> "Open Guest window"
 - "Close all your windows" -> "Exit <Profile>",
   in case there are multiple profiles
 - "Close all your windows": titlecase added

Bug: 836066, 130656
Change-Id: I526db685f3efd0c7b8623ab8a0081b9414ceed94
Reviewed-on: https://chromium-review.googlesource.com/1025758
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553503}