Fix missing "old end" value in detail log of en_CA translation (#756878)

The Canadian English translation po file incorrectly changed the
following string with a parameter from %1 to %2:

   msgid "old end: %1"
   msgstr "old end: %2"

The error resulted in a missing "old end:" numerical value in the
gparted details log.

This error was introduced back in 2011-09-06 with the following
commit:

   06eeaafc
   Updated Canadian English translation.

Bug 756878 - GParted - Fix missing "old end" value in detail log of
             en_CA translation