Break up long series of contiguous digits

[elsapo]

FileZilla Server 0.9.10a

In the Admin Interface, in the list control at the
bottom, it shows outstanding connections and a column
called Progress, which contains a really big number,
that I cannot really read, because it is too many
digits consecutively with no delimiter, and they keep
changing so I cannot even focus on it trying to count
out how many there are from one side to the other.

Adding commas every three digits (or every four, or
whatever) would help a lot.

[eyebex]

See #3916.