(bug 44158) Improve localization in flyout of curation tool.

* Adds localization for 'close flyout'
* Adds message for 'Mark for deletion' in delete flyout
* Removes unnecessary title in next.js

Change-Id: Ib7eb7bcc855ff7571a98a3193d841e4c3cba52a3
Merge "(bug 44158) Improve localization in flyout of curation tool."