* get deprecation workflow up to date
* fix routing.transition-methods deprecation
* fix this-property-fallback deprecation
* fix implicit-injections deprecation
* argument-less-helper-paren-less-invocation
* remove unmaintained ember-transition-helper which triggers deprecated-run-loop-and-computed-dot-access deprecation
* reset to only log but not throw on errors to not block other development
* reset double quote to single quote changes in templates and fix Prettier config
* fix JS linting
* ugprade ember-template-lint to fix parser
* replace ember-cp-validations with custom validation logic for poll creation
* refactor poll participation to not use ember-cp-validations
* drop ember-cp-validations from create.settings route
* remove unused leftovers from ember-cp-validations
* fix potential leak
* assertion thrown in CI tests (Firefox) indicate that listener is cleaned up automatically
* synchronize translations
> helpers/poll-has-users.js should pass jscs.
> requireSemicolons: Missing semicolon after statement at helpers/poll-has-users.js
is incostitent with JSHint which complains about this semicolon
other ones should be fixed by rewrite of create/options
before it was done as computed properties of model
accessing encryption key in serializer is done via global application var.
this should be removed in long-term
