Resyncing changes for TT4 into Core.
Changes include:
* Reformatted all the patterns for readability.
* Bugfixes in the markup and improvements on the string translation functions.
* Renaming of some patterns, making them consistent with the content they show and whether they are simple patterns, full-page patterns or patterns meant to replace templates.
Follow-up to [56813], [56764], [56716].
Props richtabor, onemaggie, luminuu, shailu25, dunhakdis, shivashankerbhatta, dajeema, enodekciw, kafleg, viralsampat, glendaviesnz, beafialho, webmandesign, huzaifaalmesbah, gregfuller, benharri.
Fixes#59640.
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git-svn-id: http://core.svn.wordpress.org/trunk@56462 1a063a9b-81f0-0310-95a4-ce76da25c4cd
