code: @Nullable
    public String getErrorText (@Nonnull final Locale aContentLocale)
    {
      return m_eError == null ? null : m_eError.getDisplayTextWithArgs (aContentLocale, (Object []) m_aErrorParams);
    }
docs: Get the error text
  
  @param aContentLocale
  The locale to use. May not be <code>null</code>.
  @return <code>null</code> if no error occurred, the error text otherwise.