Bug#906884: totem: fails to download subtitles

[seb]

Package: totem
Version: 3.26.1-1
Severity: normal

Dear Maintainer,

It is impossible to download the subtitles of a video. When I try, no window appears and I get the following messages on the console:
TypeError: _show_dialog() takes 2 positional arguments but 3 were given

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.17.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages totem depends on:
ii  grilo-plugins-0.3               0.3.7-1
ii  gsettings-desktop-schemas       3.28.0-1
ii  gstreamer1.0-clutter-3.0        3.0.26-1
ii  gstreamer1.0-plugins-base       1.14.2-1
ii  gstreamer1.0-plugins-good       1.14.2-1
ii  gstreamer1.0-x                  1.14.2-1
ii  libc6                           2.27-5
ii  libcairo2                       1.15.10-3
ii  libgdk-pixbuf2.0-0              2.36.12-1
ii  libglib2.0-0                    2.56.1-2
ii  libgstreamer-plugins-base1.0-0  1.14.2-1
ii  libgstreamer1.0-0               1.14.2-2
ii  libgtk-3-0                      3.22.30-2
ii  libnautilus-extension1a         3.26.3.1-1
ii  libpango-1.0-0                  1.42.1-2
ii  libpangocairo-1.0-0             1.42.1-2
ii  libtotem-plparser18             3.26.0-2
ii  libtotem0                       3.26.1-1
ii  libx11-6                        2:1.6.5-1
ii  totem-common                    3.26.1-1

Versions of packages totem recommends:
ii  gstreamer1.0-libav         1.15.0.1+git20180723+db823502-1
ii  gstreamer1.0-plugins-bad   1.14.2-1
ii  gstreamer1.0-plugins-ugly  1.14.2-1
ii  gstreamer1.0-pulseaudio    1.14.2-1
ii  totem-plugins              3.26.1-1

Versions of packages totem suggests:
pn  gnome-codec-install  <none>

-- no debconf information