How to add a localization *.po file to a package?

[Stan Vasilyev <stan.vasilyev@csun.edu>]

I'm the new maintainer for xdialog package. A user has submitted a new 
localization file ca.po via the BTS. I'm trying to include this file in the 
package. 

In order for this file to compile into the package I need to change the 
configure.in and add "ca" to ALL_LANGUES. Doing so breaks the package because 
the make scripts run aclocal and automake and a lot of files get changed, 
after which debuild complains that "unable to represent changes to foo, 
binary contents changed".

How do I add a translation without modifying the configure.in? Even if I fix 
the "binary contents changed" errors of debuild, wouldn't that make diff.gz 
rather large?

Thanks,
Stan