String change needed in gnome-games

[Callum McKenzie <callum physics otago ac nz>]

As per bug #134442 there is a typo. I'm going to update it tomorrow
night unless anyone objects. Only a few people have so far translated
the string, but I see at least one person made a wrong guess at the
correct word (I can't remember who, I'm at work and can't check) so
those of you who have translated the string should check you have translated
the correct string.

The correct word is collide, for details see:

http://bugzilla.gnome.org/show_bug.cgi?id=134442

 - Callum




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