I don't know which url scheme is supported by google translate application, but you can open iTranslate application using this -
To launch the application:
NSString *stringURL = @"itranslate://";
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
To translate text:
NSString *textToTranslate = @"Hello world";
textToTranslate = [textToTranslate stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *test = [NSString stringWithFormat:@"itranslate://translate?from=en&to=de&text=%@",textToTranslate];
NSURL *url = [[NSURL alloc] initWithString:test];
[[UIApplication sharedApplication] openURL:url];
also look at this - http://wiki.akosma.com/IPhone_URL_Schemes
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