Hi Josep,
Thank you for your patience.
We have checked the mentioned issue with custom resource of Schedule localization in WPF and all the string values has loading and setting accordingly. We have prepared sample based on this, please find the below sample.
Note: Default calendar properties such as day, month names localize based on culture, other custom strings can be localized based on given values.
If the given solution doesn’t meet your requirement, could you please revert to us modifying the provided sample with more details about your query, it will be helpful for us to check on it and provide you the better solution.
Regards,
Subburaj Pandian V.