* 4.3:
add back possibility to use form themes without translations
[HttpClient] fix Psr18Client handling of non-200 response codes
[WebProfilerBundle] fix FC with HttpFoundation v5
[OptionsResolver] fix adding $triggerDeprecation to Options::offsetGet()
[Form] test case is not legacy
Fix reporting unsilenced deprecations from insulated tests
fix handling nested embeddables
Added FormInterface to @return Form::getClickedButton docblock