GitLab

Adds missing punctuation to the reverse scrolling setting strings that
were causing i18n issues.

Screenshot (same image):
https://storage.cloud.google.com/chromium-translation-screenshots/f516453a6d7a904e39e84ec3a0aa12b6e0343203

Buganizer bug: https://buganizer.corp.google.com/issues/169863233

Bug: 1132398
Change-Id: I0de91a3ed664bbaab97dd92c9382a1569e113329
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443212
Commit-Queue: Daniel Classon <dclasson@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812958}