build: Include translations in uploaded zip files

The meson port accidentally dropped translations from the generated
zip files for uploading to extensions.gnome.org, add them back.

#69
1 job for wip/fmuellner/fix-ego-translations in 1 minute and 4 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build-shell-extensions #30761

00:01:04