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/java/com/example/views/FormView.java

@@ -76,6 +76,12 @@ vorname.setAutofocus(true);
                 .setToday(getTranslation("form.today"))
                 .setCancel(getTranslation("form.cancel")));
         TimePicker uhrzeit = new TimePicker(getTranslation("form.time"));
+        uhrzeit.setLocale(Locale.GERMANY);
+        uhrzeit.setI18n(new TimePicker.TimePickerI18n()
+                .setBadInputErrorMessage(getTranslation("form.time.badInput"))
+                .setRequiredErrorMessage(getTranslation("form.time.required"))
+                .setMinErrorMessage(getTranslation("form.time.min"))
+                .setMaxErrorMessage(getTranslation("form.time.max")));
 
         ComboBox<String> land = new ComboBox<>(getTranslation("form.country"));
         land.setItems(getTranslation("country.de"), getTranslation("country.at"),