Avoid accessing ThreadLocal

[mkurz]

• Requires HV-2219 Expose constraint validator payload to message interpolators hibernate/hibernate-validator#1989
  • Ticket: https://hibernate.atlassian.net/browse/HV-2219
  • Means we need to wait for at least next Hibernate Validator release (but not urgent anyway)

Covered by following test:

playframework/web/play-java-forms/src/test/scala/play/data/FormSpec.scala

Lines 1630 to 1652 in 8c364d6

	"have the validator translate error messages correctly" in new WithApplication(
	application("play.i18n.langs" -> List("de", "en", "ja"))
	) {
	override def running() = {
	val myFormJa = formFactory
	.form(classOf[JavaI18NValidatorForm])
	.bind(new Lang(Locale.JAPANESE), TypedMap.empty(), Map("note" -> "foo").asJava)
	myFormJa.errors("note").get(0).message() must beEqualTo("10 から 100 の間のサイズにしてください")
	val myFormEn = formFactory
	.form(classOf[JavaI18NValidatorForm])
	.bind(new Lang(Locale.ENGLISH), TypedMap.empty(), Map("note" -> "foo").asJava)
	myFormEn.errors("note").get(0).message() must beEqualTo("size must be between 10 and 100")
	val myFormDe = formFactory
	.form(classOf[JavaI18NValidatorForm])
	.bind(new Lang(Locale.GERMAN), TypedMap.empty(), Map("note" -> "foo").asJava)
	myFormDe.errors("note").get(0).message() must beEqualTo("Größe muss zwischen 10 und 100 sein")
	// French not defined in config, fall back to default (which is german, since it is first in the list)
	val myFormFr = formFactory
	.form(classOf[JavaI18NValidatorForm])
	.bind(new Lang(Locale.FRENCH), TypedMap.empty(), Map("note" -> "foo").asJava)
	myFormFr.errors("note").get(0).message() must beEqualTo("Größe muss zwischen 10 und 100 sein")
	}