i18n and patchwork messages !!!

I hope this makes someone happy by having default text being copied over
and over again. Anyway good luck for the next 20+ fixed property
messages.

[1] https://gerrit.wikimedia.org/r/#/c/67609/7/languages/SMW_Messages.php

Change-Id: Icde56b3ca37ae72d9e69f26e7c62676874d44c69