Issue #2315303 by dakala: Rename *.yml files.
Issue #2306127 by dakala: Fixed Install error. The 'field_config' entity type does not exist.
Issue #2323929 by dakala, schtom: Implement newly introduced FormStateInterface.
Improve tests fixing some bugs
Conflicts:
	poll.module
	src/Tests/PollBlockTest.php
	src/Tests/PollCreateTest.php
	src/Tests/PollDeleteChoiceTest.php
	src/Tests/PollExpirationTest.php
	src/Tests/PollJsAddChoiceTest.php
	src/Tests/PollTestBase.php
	src/Tests/PollVoteCheckHostnameTest.php
	src/Tests/PollVoteTest.php
	templates/poll-results.html.twig
Fix Language in src/Entity/Poll.php