@SuppressWarnings("nls")
	private static final String normalizeNumber(String buffer, boolean localized) {
		if (buffer == null) {
			return "";
		}
		buffer = buffer.replaceAll(localized ? LOCALIZED_GROUPING_SEPARATOR : ",", "").trim();
		if (buffer.length() > 0 && buffer.charAt(0) == '+') {
			return buffer.substring(1).trim();
		}
		return buffer;
	}