GitLab

This CL makes the app build with i18n resources and replaces some
hardcoded texts with the localized strings.

Follow up CLs will be needed to fully localize the app.

Bug: 
Change-Id: I78476ed413e0283b56d7053418ec47138d4d72f5
Reviewed-on: https://chromium-review.googlesource.com/578187Reviewed-by: Scott Nichols <nicholss@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488077}