/usr/share/GConf/gsettings/opensubtitles.convert is in totem-common 3.26.0-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | [org.gnome.totem.plugins.opensubtitles]
language = /apps/totem/plugins/opensubtitles/language
|