Rename Download and Language settings fragments

Following the naming conventions decided in
go/clank-preferences-refactor, this change replaces the "Preferences"
suffix with "Settings".

Bug: 1030446
Change-Id: If2d5923a5406ce2b9b98b3d4f80fd76b89f0da86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1953983
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723088}
8 files changed