Plugin install cards:

* Move author attribution to its own line.
* Use `esc_url()` where appropriate.
* Better i18n.
* min-height for cards for a more even appearance.
* Show more cards on wide screens.
* Tighten up spacing below the filter bar.

props ocean90, helen. see #28785.

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git-svn-id: http://core.svn.wordpress.org/trunk@29003 1a063a9b-81f0-0310-95a4-ce76da25c4cd