Add Dutch translations for all missing translation keys and fix hardcoded English labels

app/Filament/Pages/General/ThemeSettings.php

@@ -36,7 +36,10 @@ final class ThemeSettings extends Page implements HasForms
     }
 
     #[\Override]
-    protected static ?string $title = 'Theme & Button Settings';
+    public static function getTitle(): string
+    {
+        return __('Theme & Button Settings');
+    }
 
     #[\Override]
     protected string $view = 'filament.pages.general.theme-settings';