update kirby to v5 and add refresh cache panel view button

public/kirby/config/fields/select.php

@@ -1,6 +1,7 @@
 <?php
 
 use Kirby\Field\FieldOptions;
+use Kirby\Toolkit\I18n;
 
 return [
 	'extends' => 'radio',
@@ -17,10 +18,10 @@ return [
 			return $icon;
 		},
 		/**
-		 * Custom placeholder string for empty option.
+		 * Text shown when no option is selected yet
 		 */
-		'placeholder' => function (string $placeholder = '—') {
-			return $placeholder;
+		'placeholder' => function (string|array $placeholder = '—') {
+			return I18n::translate($placeholder, $placeholder);
 		},
 	],
 	'methods' => [