Pass --check to msgfmt and fix broken format strings

The check option discovers broken format string translations as
well as other issues like broken headers, enable it.

The Japanese translation was discovered to both use the wrong
ordering for %.*s translations with different positions, and
missing the dot, e.g.

    %1$*2$s should have been %2$.*1$s

    (the number after % matches the string and the number after
     .* the size)

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