Notifies the receiver of a language your spelling checker can check.
Original signature is '- (BOOL)registerLanguage:(NSString *)language byVendor:(NSString *)vendor'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |

Returns YES if the language is registered, NO if for some reason it can’t be registered.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)