Automatic merge from branch-5.3

* origin/branch-5.3:
  SONAR-7093 Allow projects to define their leak period
  fix display of date leak period

diff --cc it/it-tests/src/test/java/it/measureHistory/DifferentialPeriodsTest.java
Simple merge

diff --cc it/it-tests/src/test/java/util/ItUtils.java
Simple merge

diff --cc sonar-core/src/main/java/org/sonar/core/config/CorePropertyDefinitions.java
Simple merge

diff --cc sonar-core/src/main/resources/org/sonar/l10n/core.properties
Simple merge