With LANG=de_DE.UTF-8 and GDM_LANG=de_DE.UTF-8, run gnome-calculator
from an xterm, open the currency conversion, and set the source currency
to Britische Pfund Sterling (GBP) and the target currency to Euro (EUR).
Now, enter the digit 1 into the field for the source amount. You'll see
some nonzero rate (in my case, 1.14…) in the target field. Then, type in
the decimal separator, be it either the comma or the point. In either
case, you'd see 0 in the target field. Instead, you should see the same
rate as before (in my case, 1.14…) in the target field, as 1=1. .
Continuing typing in digits doesn't change the zero.

The bug doesn't occur if you run `LANG=en_GB.utf8 gnome-calculator` or
`LANG=en_US.utf8 gnome-calculator` from an xterm.

Please fix this!

Gratefully
Pater