code: public static String getString(final ResourceBundle source, final String key, final String defaultValue)
  	{
  		try
  		{
  			return source.getString(key);
  		}
  		catch (Exception _exception)
  		{
  			return defaultValue;
  		}
  	}
docs: Return an string from a ResourceBundle.
  
  @param source
  ResourceBundle from which extract the value
  @param key
  The key to retrieve the value
  @param defaultValue
  When the wanted value doesn't exist, return this one
  @return The wanted object or defaulValue