Backend error: multiple tabs with special characters

[omarkohl]

When logging in with a spanish user (the backend is in spanish) and trying to edit a page of type ImageGallery you get 10 tabs of type "Configuración" (Configuration). Editing the spanish translation and taking out the ó (using a regular o instead) the problem disappears. My first guess is that the problem is inside getCMSFields() in ImageGalleryPage.php and shouldn't be difficult to fix.