Localize the ReportViewer control User Interface in SSRS

To provide custom localization of the ReportViewer control user interface, implement the IReportViewerMessages interface. All that needs to be done is add a setting tag to your web.config file using the key “ReportViewerMessages”.

For example:

namespace MyNamespace
{
public class MyClass : IReportViewerMessages
{
// implement interface
}

<appSettings>
<add key="ReportViewerMessages"
value="MyNamespace.MyClass, MyClass" />
</appSettings>

where value = Class, Assembly

Note: value = "" will display the default values for your ReportViewer UI.

Get an entire list over here : http://msdn.microsoft.com/en-us/library/microsoft.reporting.webforms.ireportviewermessages.aspx