PATCH: Use hyphen for copyright range in About box

[Stephan Bergmann]

On 06/21/2012 07:30 PM, Robinson Tryon wrote:
> Per https://bugs.freedesktop.org/show_bug.cgi?id=43180
>
> Hyphens more clearly describe a date range, rather than just a
> discrete list of years (e.g. "Widget Foo was produced in years 1950,
> 1961-1963, 1969").

Incidentally, just came across 
<http://gcc.gnu.org/ml/gcc/2012-07/msg00013.html> "Re: Allow use of 
ranges in copyright notices."

Stephan