Better way to retry curl
Use infinity instead of 3000-01-01 as max date.

This fixes the y3k problem in Discourse that made topics with pins
appear after threads updated in year 3000.
Add unit tests for testing if infinity as highest_date works.
Fix ordering of posts in posts in order unit test.
clarify too_few_topics warn only appears for staff
clarification on delete and block
tighten spacing on flags page
Merge pull request #2638 from MiteshShah/patch-1

Better way to retry curl
FIX: Missing translations, update title on About
TESTS: Adds integration test for new about route
FIX: don't allow same category name with different case
Merge pull request #2644 from xfix/y3k

Year 3000 problem while displaying thread pins.
FIX: Don't show the category edit button unless the user can edit the
category
FIX: actually compute top score for 'older' periods
UX: Add a separate "Sign Up" button
UX: Remove icon from sign up button, change button order
UX: Remove likes column, use heat map on posts count
CLEANUP: This file no longer seems to be used
Revert "CLEANUP: This file no longer seems to be used"

This reverts commit 5c2893c8f9c2b64e99f24cf75f525ec1ac693bb9.
ES6: Transition helper