GitLab

 - strings for the spell check hint are added
 - the autocomplete-searches description is updated

Bug: 855945, 864793
Change-Id: I33b520fbef30122e6add794d71d8f48053fc253c
Reviewed-on: https://chromium-review.googlesource.com/1143304Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576469}