Bug#1066887: Patch not sufficient

[M. Buecher]

Unfortunately enhancing `locale-gen` doesn't work during an package 
update via apt:

...
Setting up locales (2.36-9+deb12u4) ...
Generating locales (this might take a while)...
  en_US.UTF-8... done
  en_DE.UTF-8@INTL...[error] cannot open locale definition file 
`en_US@INTL': No such file or directory
 done
  en_US.UTF-8@INTL... done
Generation complete.
...