NSLocalizedString only retrieves the key, not the value in Localizable.strings (IOS)

I've made a strings file named "Localizable.strings" and added two languages to it, like so:

"CONNECTIONERROR" = "Check that you have a working internet connection.";
 "CONNECTIONERRORTITLE" = "Network error";
 

I have also converted the files to Unicode UTF-8
However, when I create a UIAlertView like this:

 UIAlertView *myAlert = [[UIAlertView alloc]
  initWithTitle:NSLocalizedString(@"CONNECTIONERRORITLE",nil)
  message:NSLocalizedString(@"CONNECTIONERROR",nil)                    
  delegate:self
  cancelButtonTitle:@"Ok"
  otherButtonTitles:nil];
 

the alert view only shows the key text, not the value. It works if I, for example, set a UITextviews text to NSLocalizedString(@"CONNECTIONERROR",nil), but the alert view only displays the key. Anyone know what's wrong?

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