The NLS feature is supported for the language-dependent text in the label objects, DBFields, parameters, formulas, summaries, some special fields (Print Date, Fetch Date, Modified Date, Page N of M, Global Page N of M, group-by field), table/view/synonym columns, imported SQL columns and so on. JReport Designer provides with two editors to edit NLS:
Data Mapping Editor
The Data Mapping Editor is used to map data values of resources in a catalog to a specific language, so that when you use the resources in reports, you can display their values in the mapped language.
NLS Editor
The NLS Editor is used to edit the language information of a report and the current catalog and stores the information in a NLS property file.