[9] RFR 8059462: Typo in keytool resource file

[Vincent Ryan]

Please review this correction to a key used by the keytool utility to access 
its L10N strings:

Webrev: http://cr.openjdk.java.net/~vinnie/8059462/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8059462

Thanks.