Lute v3

Feature changes:

• #53: add “don’t stop audio on term click” setting
• #295: add “open popups in new tab” setting
• #256: add “translate full page” reading menu link
• #209: Ctrl+Enter hotkey saves Term form while reading
• Fix Arabic and Chinese default dicts. By @imamcr in #296, #298
• #199: Add delete audio button for book.
• #250: allow hide some book columns in listing.
• #288: open pop-up dictionary if it’s the first dictionary specified

Bugfixes:

• #300: include pronunciation in csv export.

Back end changes:

• Update datatables to 2.0.1, include colvis.
• #289: make global js vars’ relation to class explicit.