Update the Docker image

The Docker image only contained English localizations, so Gtk+ was not
translated in French -.-'
7 jobs for 164-mingw-gtk-data-is-dead in 51 minutes and 39 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Dist
passed dist #548899

00:39:46

 
  Check
passed check #548900

00:05:10

passed deb #548902

00:07:18

passed generate #548903

00:08:09

passed mingw #548901

00:08:01

 
  Manual
passed pages #548904

00:01:49

 
  Deploy
passed pages:deploy

00:00:01