Hello,
When working in Spanish or French, even if internationalization is properly configured, it is not possible to translate the items in the FormatBlock, so it is only possible to see them in English.
We tried to do it ourselves (https://www.telerik.com/forums/paragraph-and-heading-not-translated) but we found some issues, so please, consider including these few items in the default translations.
Thanks
LucĂa