Merge branch 'master' into 5940_testRenamingAndCorrectFolders

README.md

composer.json

composer.lock

config/global.ini.php

core/Config.php

core/DataTable/Filter/GroupBy.php

core/DataTable/Renderer/Csv.php

core/EventDispatcher.php

core/Option.php

core/Piwik.php

core/ReportRenderer/Html.php

core/Tracker.php

core/testMinimumPhpVersion.php

lang/cs.json

lang/da.json

lang/de.json

lang/el.json

lang/en.json

lang/es.json

lang/et.json