fix: thank you message translation (#59)

* fix thank you message translation

currently the `mauricerenck.komments.thankyou` message is always shown in the default language, no matter what the current language is.
maybe related to `t()` helper not working in this context.
fix by using `I18n::template()` instead.

* Update index.php

use `translate()` instead of `template()`, as suggested here: #59 (comment)

index.php

@@ -6,6 +6,7 @@
 use mauricerenck\Komments\KommentReceiver;
 use Kirby;
 use Kirby\Http\Response;
+use Kirby\Toolkit\I18n;
 
 @include_once __DIR__ . '/vendor/autoload.php';
 
@@ -70,7 +71,7 @@
                     $response = [
                         'status' => 'success',
                         'pending' => true,
-                        'message' => t('mauricerenck.komments.thankyou'),
+                        'message' => I18n::translate('mauricerenck.komments.thankyou', null , kirby()->languageCode()),
                         'data' => $webmention
                     ];