Fix: Cancel link click if triggered as part of text selection

Prevent a click if the user select content in a topic and release the mouse over a link.

https://meta.discourse.org/t/selecting-a-link-results-in-it-being-opened/14846
return true when invoke verbose_localization_session
Fix: rapid/continuous keyboard Next event under Topics List view may lose selected item on "load more"

Using Next keyboard shortcut (J) rapidly while reaching last item in the topic list and
causing a "load more". The handler might get into a state where it can not detect any selected item due to the delay from Em.run.next
and will result in position reset.

+added boundary check of last item on next, early in the handler to avoid unnecessary computations 


https://meta.discourse.org/t/keyboard-shortcut-next-previous-continues-key-down-reset-to-first-item-in-list-on-load-more/20042
Add pl_PL translations for Poll plugin and update translations
FIX: Bracked category link in no-JS view
Adds govcloud region to s3 region list
FIX: Using k on Firefox to navigate up the topic list

Using k wouldn't always bring the topic in focus as you moved up the topic list
https://meta.discourse.org/t/topic-list-keyboard-shortcut-previous-k-does-not-scroll-properly-leaving-selected-item-hidden-firefox/20050
Merge pull request #2797 from fantasticfears/master

return true when invoke verbose_localization_session
Merge pull request #2800 from riking/nojs-subcategory

FIX: Bracked category link in no-JS view
Merge pull request #2799 from techAPJ/patch-2

Add pl_PL translations for Poll plugin and update translations
Merge pull request #2802 from cpradio/firefox-use-k-to-scroll-up

FIX: Firefox - Topic List Keyboard shortcut Previous(K) does not scroll properly leaving selected item hidden
Merge pull request #2801 from jrhe/s3_govcloud_support

Adds govcloud region to s3 region list
Merge pull request #2798 from lidlanca/patch-3

Fix: rapid/continuous keyboard Next event under Topics List view may lose selected item on "load more"
FEATURE: display reply to post on mobile
FIX: If a post has been hidden due to flagging, don't use the absolute
edit window for edit prevention.
FEATURE: fenced code blocks can hint with "pre" or "text"

Use ```pre or ```text for unhiglighted code blocks
show parent and child category in oneboxes
UX: Move emoji setting into 'Plugins' category
FIX: Support ember app routing to topics with only slugs
SECURITY: Stripping links could unescape html fragments