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)
syncing

Merge branch 'master' of https://github.com/joomla/joomla-cms