Add RTL support.
Merge pull request #2525 from eyalev/rtl-support

Add RTL support.
FEATURE: add a welcome topic to the Lounge category. Copy needs to be improved.
remove legacy category "footer" styles
Update translations
remove word "subcategories" from mobile cat page
category-list-item only used in mobile layout
Merge pull request #2527 from techAPJ/patch-3

Update translations
initial "Welcome to the Lounge" copyedit
Version bump to v0.9.9.12
switch /faq to /guidelines in a bunch of places
add FAQ wiki instructions to Admin Quick Start
FEATURE: phpbb import script: update links to other topics so they refer to the new site; fix weird links that break after import
FEATURE: First Quote badge
To be fixed properly tomorrow.
FEATURE: Read Faq badge
correct badge query
FIX: pretending to support too many accelerated files

This broke sidekiq web

(sidekiq serves resources out of /vendor/ path)
FEATURE: reject accounts created with an email address similar to a known spammer email
BUGFIX: multiple sub/sup