improve starred topics education copy
remove hard-coded CSS on 404 page
change revision markup view to say "raw"
FEATURE: hide google search on 404 page for private instance
Show category badge on 404 page topics
Add group names to user export csv
making topic/post selection left border stronger
Merge pull request #2762 from techAPJ/patch-1

Show category badge on 404 page topics
Merge pull request #2763 from techAPJ/patch-3

Add group names to user export csv
Merge pull request #2764 from awesomerobot/master

making topic/post selection left border stronger
FIX: Some default group names could not be translated
UX: remove bookmark icon from Unread topnav
add spaces for flag/admin glyphs on hamburger
FIX: quote icon in Quote Reply not clickable
UX: remove current username from header
improve education panels on new, unread, starred
slight update to topnav education panels
minor copy tweaks
FEATURE: add age to results of search
dark themes now carry over to admin without looking absolutely terrible