The version is file-roller-3.19.91-1.fc24.x86_64

Perhaps you are a victim of the locale split in glibc ?

Here is what I am seeing when I run file-roller in pl_PL:

$ LANG=pl_PL.utf8 file-roller

(file-roller:13519): Gtk-WARNING **: Locale not supported by C library.
	Using the fallback 'C' locale.

I do have glibc-langpack-pl installed, and I get nothing in the console.


I was thinking it might be connected with .mo file names:

[piotrdrag@Piotrek-laptop ~]$ rpm -ql file-roller|grep desktop
/usr/share/applications/org.gnome.FileRoller.desktop

[piotrdrag@Piotrek-laptop ~]$ rpm -ql file-roller|grep locale/pl
/usr/share/locale/pl/LC_MESSAGES/file-roller.mo


Compare to a correctly working application:

[piotrdrag@Piotrek-laptop ~]$ rpm -ql gnome-characters|grep desktop
/usr/share/applications/org.gnome.Characters.desktop

[piotrdrag@Piotrek-laptop ~]$ rpm -ql gnome-characters|grep locale/pl
/usr/share/locale/pl/LC_MESSAGES/org.gnome.Characters.mo


I observe the same in gnome-calendar (bug #1320773), but there might be more.

Same issue with French translation

Fixed in file-roller.x86_64 3.20.1-1.fc24.