title: NSNumberFormatter with comma decimal separator
body: <p>I tried to convert an NSString like "12000.54" into "12.000,54". I wrote an NSNumberFormatter instance. </p>
  
  <pre><code>NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease];
  [formatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
  [formatter setNumberStyle:NSNumberFormatterDecimalStyle];
  [formatter setGroupingSeparator:@"."];
  [formatter setDecimalSeparator:@","];
  </code></pre>
  
  <p>But when I NSLog this :</p>
  
  <pre><code>NSLog(@"%@",[formatter stringFromNumber:[formatter numberFromString:value]]);
  </code></pre>
  
  <p>It prints null value. If I change my comma with a point it's working correctly. I just would like to be able to put what I want for my separators field (comma, point, slash, etc ...) and I have different outputs : 12/000,54 12.000.54 12,000,54 for example.</p>
  
  <p>Do you know how I can handle this ?</p>