POTFILES.in updated in the trunk, revision 10440.
@Nick - Why did you remove the translation underscore in the name elements (should be <_name></_name>)?
I realize I didn't explain you how to correctly update the extension. There are two files you may need to modify:
* po/POTFILES.in, which lists the files that have translatable content.
* share/extensions/Makefile.am, in order to copy the files to the install location.
Of course, there's nothing to change if you don't add or delete INX or py files.
Thanks for the update!