Hi Lunatik,
Thanks for your interest in Syncfusion Products.
The SerializeCellsBehavior property of GridControl is used to localize the cell data into resource files, by setting SerializeIntoResX to this property.The grid uses the cell specific CultureInfo to do formatting for cell values like integers or doubles present in the cell values. But, you can apply localization to the whole grid and store in the different ResX file which are generated for each property of the Form.
Please refer the sample which shows the idea:
Here is a samplePlease let me know if this helps.
Regards,
Nisha