Add missing POTFILES.in for intltool-update support

[ericbsd]

Summary by Sourcery

Build:

• Add POTFILES.in listing translatable sources so intltool-update can regenerate the message catalog correctly.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the missing po/POTFILES.in file required by intltool so that translation POT files can be generated correctly.

File-Level Changes

Change	Details	Files
Introduce a new POTFILES.in file to integrate with intltool and drive POT generation.	Create a new POTFILES.in file under the po directory. Populate POTFILES.in with the list of source files (or the expected structure) to be scanned for translatable strings by intltool-update. Align the project’s i18n setup with intltool’s expectations so that msgids can be extracted consistently.	po/POTFILES.in

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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