Please try the following steps, and let me know your results.
1. Go to WPML -> String Translation.
2. Click on the "Translate texts in admin screens »" link.
3. Search for the site logo ID or URL.
4. Select the strings you wish to translate.
5. Click on the "Add to String Translation" button.
6. Return to String Translation by clicking the "« Return to String Translation" link.
7. Translate the selected strings.