title: Get the Key with the NSLocalizedString
body: <p>I have a Spanish Localization File like this:</p>
  
  <pre><code>"Not Selected" = "No Seleccionado";
  </code></pre>
  
  <p>and my device is in spanish language ,i use English as default </p>
  
  <p>I load a NSArray for using like datasource of a pickerView with several Strings :</p>
  
  <pre><code>elementsPickerViewSubConstituencyPatient=[[NSArray alloc] initWithObjects:NSLocalizedString(@"Not Selected",nil),
                                                                            NSLocalizedString(@"Carer",nil),
                                                                            NSLocalizedString(@"London Based",nil),
                                                                            NSLocalizedString(@"Non-London Based",nil), nil];
  </code></pre>
  
  <p>in another method i want to recover the user selected value with:</p>
  
  <pre><code>NSInteger selectedRowConstituency= [self.constituencyFieldPickerOutlet selectedRowInComponent:0];
      NSString *selectedValueConstituency = elementsPickerViewConstituency[selectedRowConstituency];
      NSLog(@"Constituency: %@",selectedValueConstituency);
  </code></pre>
  
  <p>it works but it return the Spanish Value and i need the English Key , i didn´t find a simple way to do this .thanks</p>