Adding Extended Characters to Java Properties File

Recently, I was updating the copyrights text in amConsole.properties.
the copyrights text contains extended ASCII characters because part
of the copyrights/license is in France.
Java Properties file cannot have extended ASCII characters, we need to
have them in Hex e.g. \u00e0 for à
Here is a small program that converted extended ASCII characters to
Hex.
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;

public class [...]