GitLab

The goal is to make more clear to translators that they are supposed to
choose either YY/MM or MM/YY.

Change-Id: I5c84a566ac83e15e59bbca413506035197553c0a
Reviewed-on: https://chromium-review.googlesource.com/1146665
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577210}