Add localization for Java EOL alert

Freenet will soon be moving to require Java 7, but first must warn users
of this change. Adding this text allows translations of it before the
alert code has been written.

Via http://www.oracle.com/technetwork/java/javase/eol-135779.html
"After February 2013, Oracle will no longer post updates of Java SE 6 to
its public download sites."