Change location dialog in iOS using google api v3 maps

I am using the Google Maps v3 javascript API to display a map in a UIWebView.

However, when a dialog box appears asking for user permission for locationServices, I get a rather long, cryptic string. With CoreLocation, I can add a convenient message (target) to display another message, however I cannot use CoreLocation (for various reasons), because web pages request permission, although "the application may already have it."

How can I change this dialog text to something more user-friendly?

Thanks in advance!