FULL PRODUCT VERSION :
bug found on 8.151 b12
Stil present on commit 4ba184f0b4f6d0c113d58a09d0f124d0c55836ec on November 9 in jdk8u-dev mercurial

A DESCRIPTION OF THE PROBLEM :
keytool -importcert fails on French OS.

in sun.security.tools.keytool.Resources(_fr)

The english message are
        {"key.bit", "%d-bit %s key"},
        {"key.bit.weak", "%d-bit %s key (weak)"},

when the French message are
        {"key.bit", "Cl\u00E9 %s %d bits"},
        {"key.bit.weak", "Cl\u00E9 %s %d bits (faible)"},

The %s and %d are swapped and the call
sun.security.tools.keytool.Main, line 3076
            return String.format(rb.getString("key.bit"),
                    KeyUtil.getKeySize(key), key.getAlgorithm());

fails on French enviroment


REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Use older version or change OS language