v2.7.0

• NEW: Selectable dark mode for app UI and for articles (does not work on IE11)
• NEW: Optional transition between app pages
• NEW: Native asset caching in Service Worker mode - considerably speeds up article load times in some contexts
• UPDATE: Privacy Policy
• UPDATE: Minor changes to Kiwix icon
• UPDATE: Bootstrap updated to v4
• UPDATE: Q Promise library updated to v1.5.1
• UPDATE: Various code simplifications and cleanup
• BUGFIX: Support details-summary tags to ensure all article subheadings are open in jQuery mode
• BUGFIX: Broken display when search results have special characters
• BUGFIX: Display of random article fragments when using back/forward buttons quickly
• BUGFIX: Several UI bugs (search results disappearing, redundant scroll bar)