[IOS][Language] Language Settings - Move files to language/ subdirectory

Bug: 957688
Change-Id: I3d4afd4dadbabfb544b7741ae9365aac8bee29cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622326
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662180}
19 files changed