J'ai installé VLC par paquets instantanés dans Ubuntu 16.10 Yakkety Yak. Mais l'installation s'est faite en anglais (ma version d'Ubuntu est en espagnol)
Fondamentalement, la même question a été posée sur Snap (snapcraft ?) et les applications traduites et comment cela change la langue dans vlc (snap), et les fichiers de traduction pour VLC sont présents :
$ locate /vlc.mo
/snap/vlc/1/share/locale/ach/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/af/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/am/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/an/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ar/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ast/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/az/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/be/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/bg/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/bn/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/bn_IN/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/br/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/bs/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ca/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/cgg/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ckb/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/co/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/cs/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/cy/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/da/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/de/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/el/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/en_GB/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/es/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/et/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/eu/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/fa/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ff/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/fi/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/fr/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/fur/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ga/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/gd/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/gl/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/gu/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/he/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/hi/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/hr/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/hu/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/hy/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ia/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/id/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/is/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/it/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ja/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ka/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/kk/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/km/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/kn/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ko/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ky/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/lg/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/lt/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/lv/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/mk/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ml/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/mn/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/mr/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ms/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/my/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/nb/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ne/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/nl/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/nn/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/oc/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/or/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/pa/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/pl/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ps/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/pt_BR/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/pt_PT/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ro/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ru/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/si/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/sk/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/sl/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/sq/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/sr/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/sv/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/ta/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/te/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/tet/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/th/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/tl/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/tr/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/uk/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/uz/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/vi/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/wa/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/zh_CN/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/zh_TW/LC_MESSAGES/vlc.mo
/snap/vlc/1/share/locale/zu/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ach/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/af/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/am/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/an/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ar/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ast/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/az/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/be/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/bg/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/bn/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/bn_IN/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/br/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/bs/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ca/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/cgg/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ckb/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/co/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/cs/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/cy/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/da/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/de/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/el/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/en_GB/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/es/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/es_MX/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/et/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/eu/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/fa/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ff/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/fi/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/fr/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/fur/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ga/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/gd/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/gl/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/gu/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/he/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/hi/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/hr/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/hu/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/hy/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ia/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/id/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/is/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/it/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ja/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ka/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/kk/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/km/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/kn/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ko/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ks_IN/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ky/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/lg/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/lt/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/lv/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/mai/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/mk/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ml/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/mn/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/mr/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ms/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/my/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/nb/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ne/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/nl/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/nn/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/oc/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/or/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/pa/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/pl/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ps/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/pt_BR/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/pt_PT/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ro/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ru/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/si/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/sk/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/sl/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/sq/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/sr/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/sv/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/ta/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/te/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/tet/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/th/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/tl/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/tr/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/uk/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/uz/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/vi/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/wa/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/zh_CN/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/zh_TW/LC_MESSAGES/vlc.mo
/snap/vlc/1/usr/share/locale/zu/LC_MESSAGES/vlc.mo
Réponse acceptée :
Pour les applications packagées sous forme de snaps, il peut être nécessaire de modifier le code afin qu'il puisse trouver les traductions au bon endroit dans le système de fichiers.
Pour les applications et les bibliothèques qui utilisent gettext, cela signifie que l'appel à bindtextdomain() doit ajouter la valeur du $SNAP variable d'environnement au chemin du répertoire passé en deuxième argument. Toutes les applications (et/ou bibliothèques qu'elles peuvent utiliser) qui ne le font pas, peuvent en effet ne pas avoir de traductions fonctionnelles, car le chemin codé en dur utilisé pointe vers un chemin en dehors du composant logiciel enfichable.