sync 2.x#6

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kowalk wants to merge 6 commits intoCodersLab-core:2.xfrom

Commits on Jun 1, 2019

Compatibility with Symfony 4.3 (#1524)

alanpoulain
authored and
GuilhemN
committed

Commits on Jul 24, 2020

Commits on Mar 15, 2021

Fix: Deprecation: A tree builder without a root node is deprecated since symfony 4.2 (#1457)

mantis
authored and
phansys
committed

Commits on Mar 23, 2021

Merge pull request #1799 from phansys/config
GuilhemN
authored

Commits on Oct 19, 2021

Minor grammatical changes (#1887)
copiri-six
authored