Hello Joao Paulo,
With the current release of RadPivotGrid
you are not able to set localization. This feature is in our to-do list and it should be ready for the official release (in the end of February). We are sorry for the inconvenience caused.
For your next question - you can set the CustomName property on your group/aggregate description. Very soon you'll be able to use DataAnnotations as well.
Thanks for choosing RadPivotGrid
. Feel free to contact us if you have any suggestions or concerns.
the Telerik team