fix: add i18n for TimePicker matching DatePicker (#8)

Set German locale on TimePicker in FormView and wire TimePickerI18n
error messages (bad input, required, min, max) through the existing
vaadin-i18n translation bundles, mirroring the DatePicker.DatePickerI18n
setup already present in FormView.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PYAcKoXKPN3rJ7nBroKZkc

src/main/resources/vaadin-i18n/translations_es.properties

@@ -55,6 +55,10 @@ form.save=Guardar
 form.reset=Restablecer
 form.today=Hoy
 form.cancel=Cancelar
+form.time.badInput=Hora inválida
+form.time.required=La hora es obligatoria
+form.time.min=La hora es anterior a la hora mínima permitida
+form.time.max=La hora es posterior a la hora máxima permitida
 
 country.de=Alemania
 country.at=Austria