5.0.0 Beta 3

#2442: Fixes an issue where Database widgets dropped into a header or footer break after upgrading to v5
#2457: Fixes an issue where custom templates were not working
#2434: Added new settings to Theme Editor and improved keyboard accessibility
#2464: Fix issues with importing pages databases
#2465: Fixed error when editing a pages record with an editor field
#2466: Remove debug code from languages controller
#2467: Fixed issues with viewing poll results
#2468: Fixed issue with PMs not updating the last reply date
#2472: Removed call to topic->averageRating() from digest emails
#2473: Fix error on profilesync task
#2475: Various Editor Bugs
 - Issue #2379: Pages - Blocks character set issue
 - Issue #2393: Tiptap: Can't add URL to image
 - Issue #2412: Tiptap: Resizing video in Firefox
#2476: Fix display of upload fields in pages databases
#2478: Improved the UI of the Tags ACP Tree
#2480: Improved the rendering of X/Twitter embeds
#2481: Dropdown menus in the Calendar header are no longer covered by content
#2484: Polished the "minimal" and "forum feed view" layouts
#2479: Make minimal carousel separate from mini-grid carousel
#2469: Reworked the staff directory templates to allow for more useful hooking
#2477: Return all matching Font Awesome Icons in Icon Picker Search
#2449: Fix issues with adding and editing theme editor categories and settings
#2411: Fix issue where multiple menu items are marked active
#2458: Fixes an issue where titles can be missing from Featured Content/Promoted widgets
#2450: Set icons for our default navigation menu
#2443: Adds pagination to the ACP tags page for those with thousands of tags
#2427: Fix Number fields not properly validating min/max settings with decimals
#2428: Fix exception on upgraded editor widgets with attachments
#2429: Fix broken Percentage Solved statistics widget
#2430: Fixed issues with calculating upgrade cost between subscriptions
#2436: Fixed UI of Popular Contributors widget
#2437: The joined/visited dates in hovercards now wrap if there isn't enough room for both on a single line.
#2438: Removed small gap under videos in the Media Embed widget
#2421: Fixes an error when a trial license key contains a disabled_apps key