A minor pull request

> It is just one byte and I'm almost embarrassed to mention it in an
> email, but I made a pull request as there is one excess open bracket
> in Metaclasses.tex.
>
>  The Japanese translation is coming along.  We decided to go slowly
> and taking time, but surely there is steady activity on github.
>
>  Thanks!
>
> -- Yoshiki
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