[gentoo-dev] l10n.eclass: update l10n_find_plocales_changes()

[rindeal]

​
Hello everybody,

I've updated `l10n_find_plocales_changes()` from l10n.eclass. Please review
the change.

GitHub PR: https://github.com/gentoo/gentoo/pull/1308
<https://github.com/gentoo/gentoo/pull/1228>

Regards

Jan