v6.6.0

Note: This was never released in Chrome because of a translation issue. See v6.6.1 for more details.

Refresh the design of Tab Wrangler with an upgrade from Bootstrap 3 -> 4. The buttons dropped their old Chrome-like look. This also includes a full Traditional Chinese translation thanks to xbddc.ho.

Enhancements:

PR #271: Use Bootstrap 4, freshen design
#230: "Tab Lock" view should have an option to sort by ETA
73e042a: Traditional Chinese translation 🇹🇼