TinyMCE:
- Bring back loading of /langs/[locale].js and /langs/[locale]_dlg.js from PHP. Prevents errors with missing translation files when custom plugins use requireLangPack() without second argument.
- Back to using ISO 639-1 (two letter) locales as the locale is used as part of the translation file name.
See #24067, fixes #27610
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git-svn-id: http://core.svn.wordpress.org/trunk@27752 1a063a9b-81f0-0310-95a4-ce76da25c4cd