gnome-games string changes

[Callum McKenzie <callum spooky-possum org>]

Several string changes/additions in the aisleriot code.

Some strings have gone from something like "Stock left:" to "Stock left:
~a" where the ~a is the equivalent of %s in a printf format string and
is filled in with a number. Most of these will probably transform into
another already translated string since.

There is also a new game: Aunt Mary. The only new translatable string is
the name.

 - Callum