8026304: jarsigner output bad grammar

Reviewed-by: chegar, coffeys
Contributed-by: NArtem Smotrakov <artem.smotrakov@oracle.com>

src/share/classes/sun/security/tools/jarsigner/Resources.java

@@ -112,9 +112,9 @@ public class Resources extends java.util.ListResourceBundle {
         {"Please.specify.alias.name", "Please specify alias name"},
         {"Only.one.alias.can.be.specified", "Only one alias can be specified"},
         {"This.jar.contains.signed.entries.which.is.not.signed.by.the.specified.alias.es.",
-                 "This jar contains signed entries which is not signed by the specified alias(es)."},
+                 "This jar contains signed entries which are not signed by the specified alias(es)."},
         {"This.jar.contains.signed.entries.that.s.not.signed.by.alias.in.this.keystore.",
-                  "This jar contains signed entries that's not signed by alias in this keystore."},
+                  "This jar contains signed entries that are not signed by alias in this keystore."},
         {"s", "s"},
         {"m", "m"},
         {"k", "k"},