Update translations

Update translations...again, because of https://github.com/geoadmin/mf-geoadmin3/issues/596

Please guys, do update the translations yourself by doing the following:

- update `chsdi/locale/empty_chsdi.po` file
- run `buildout/bin/buildout install potranslate`
- add the translated files to your PR

If you would test it in mf-geoadmin, you would see that it's not fully translated.

Thank you