Rosetta site: make the project search perform on both the project's name and its slug.

[xibe]

Adding a user as a translator to a project is now much easier, but I noticed an issue in the search: Search is done on the project's title, not it's slug.

That can warrant a (albeit quick) search to determine what's the string to search for.

Case in point: ​this post. When searching through the Rosetta interface, the WP-SSO project can only be found with a search on "Social Sharing Optimization" (part of the project's name), and not by typing "SSO" (the slug). Both would accelerate the addition of the user to the project.

[ocean90]

Source: https://meta.trac.wordpress.org/browser/sites/trunk/global.wordpress.org/public_html/wp-content/mu-plugins/roles/

[ocean90]

In 2037:

Rosetta Roles: Include project slugs in search fields.

Also bump checked projects to the top.

Fixes #1356.