fix typo
 ^ [#31388] Admin login shows language option. Thanks Brian Teeman
(Fix #1444)
 ^ [#31383] Article manager options. Thanks Brian Teeman
(Fix: #1441)
 # [#30957] System cache issue. Thanks Dennis Hermatski
 # [#31208] No border bottom right radius and border bottom top radius
for buttons at com_finder view (2). Thanks Peter van Westen.
(Fix #1375)
Sync Crypt, Data, and Date packages to Platform 13.1 (CS only)
Sync Environment and Event packages to Platform 13.1 (CS only)
 # [#31362] Various PHP notices and strict errors. Thanks Mark Dexter
 # [#31376] JToolbar layout change breaks mobile. Thanks Roberto Segura
Just correct a small typo in spelling of calendar.
 # [#31455] Regression by [#31278]. Thanks Beat (Fix #1536)
Merge pull request #1543 from Achal-Aggarwal/calendar-typo-error

To correct a small typo in spelling of calendar.
Add system tests for components and content. Thanks Puneet Kala.
 # [#31476] Remove unneeded GROUP BY and fix duplicate article display.
Thanks Thomas Hunziker
(Fix #1542)
 # [#31445] Default value tag menu-items. Thanks Constantin Romankiewicz
(Fix #1527)
Fix problem with failing system tests.
 # [#31525] Files uninstall is failing due to missing variable. Thanks
Michael Babker (Fix #1564)
Merge branch 'master' of https://github.com/joomla-projects/joomla-cms
Merge pull request #1568 from alexukf/master

Fix typos
 # [#31496] DEBUG_BACKTRACE_IGNORE_ARGS not supported in PHP
5.3.1-5.3.5. Thanks Beat
(Fix #1566)