Xdg portal translations

[Sebastien Bacher]

Hey there,

I investigated a bit why the 'save' button in the corresponding dialog 
wasn't showing translated when using the firefox or chromium snaps and 
it seems like xdg-desktop-portal-gtk translations need some work. It's 
not really surprising since it's hosted on github and there seems to be 
no defined workflow to translate it... in any case it's user visible so 
if some translators would help

Upstream is https://github.com/flatpak/xdg-desktop-portal-gtk/ , it 
seems there is no integration so you would need to manually edit the .po 
and submit a PR with the changes

otherwise it's possible to translate on launchpad for Ubuntu which is 
easier (we can forward the .po updates upstream later)
https://translations.launchpad.net/ubuntu/+source/xdg-desktop-portal-gtk

Cheers,
Sebastien Bacher