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)