Seems to be fine now. Apparently it had been fixed with the updates of all language-pack-xx-base packages to version 1:14.04+20160720. I see gdebi.mo is included there now.
** Changed in: gdebi (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gdebi in Ubuntu. https://bugs.launchpad.net/bugs/1288258 Title: GDebi isn't localized in Ubuntu 14.04: gdebi-core package is missing /usr/share/locale directory Status in gdebi package in Ubuntu: Fix Released Bug description: When I install GDebi 0.9.3 in a Dutch localized and fully updated Xubuntu 14.04, GDebi is 100 % in English. But it should be 100 % Dutch, as the Dutch translation for GDebi on Launchpad, was completed over a year ago. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdebi/+bug/1288258/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp