v4.7.0-beta.2

Notable changes since first beta:

• Hardened the Languages panel to help prevent form resubmission spamming (thanks, Pete Cooper).
• Added ability to copy an article (from the Articles list panel) without automatically saving it (thanks, cara-tm). This is distinct from 'Duplicate' which does save the clone as Draft with a new title that includes the ID.
• Added rel attribute to newer/older tags.
• Improved the Themes update/export multi-edit options to be clearer.
• Fixed blank page on them update if no theme selected (thanks, NicolasGraph).
• Fixed layout bugs on the Themes panel (thanks, phiw13).
• Tweaked layout of upload category buttons on Images and Files panels (thanks, phiw13).
• Fixed alignment of Textfilter drodowns.
• Added a whole bunch of other visual tweaks to improve usability.
• Tightened other language text around the place (thanks, Destry).
• Fixed Diagnostics alert for All Checks Passed (thanks, Adi).
• Removed global attribute fields in tag builder, pending overall tag builder improvements.
• Fixed pagination in plugins using legacy pageby calls (thanks, Adi).
• Fixed order of Form blocks (thanks, phiw13).
• Improved Languages API and reintroduced public $textarray to help plugins authors (thanks Adi).
• Permitted multiple language identifiers in a single Textpack (e.g. en, en-us, en-gb).
• Fixed a few stray Textpack string grouping issues.
• Fixed string trim when using the escape attribute's tidy feature (thanks, cara-tm).
• Tightened data sanitization and added more defensive coding (thanks, Manuel García Cárdenas).
• Fixed /title only mode and /year/month/day/title interpretations (thanks, planeth44).
• Included new translations - thank you to all translators who work tirelessly to keep up with our code meddling.