In some cases, you would wish to keep the majority of the locale settings in your javascript language packs, but still change some of them programmatically based on certain client-side conditions.

The way this works is the following - if a specific value for a property is not specified in the ASPX/C# code, the default from the language pack will be used. If it is specified in code however, it will override the language pack default.

A common example for this is customizing the EditDialog for example. By default (if English language pack is used), the default caption of the dialog and the submit/cancel buttons will have these values (take from grid.locale-en.js):

edit : {      
   editCaption: "Edit Record",
   bSubmit: "Submit",
   bCancel: "Cancel"
}

If you want to change that however, just set the respective settings in the EditDialogSettings collection of jqGrid, e.g.

<trirand:JQGrid runat="server" ID="JQGrid1" DataSourceID="LinqDataSource1">
   <EditDialogSettings Caption="My New Caption" SubmitText="My Submit Text" CancelText="My Cancel Text" />
</trirand:JQGrid>

This principle applies to most options in the grid.