Django-modeltranslation now takes NULL fields into account
Rewrite conditions on translated publication logics
Fix form problem where trek cannot be unpublished by language
Fix synchronization of not null boolean fields
Get rid of print
Merge branch 'fix_cannot_unpublish_by_lang' into develop
Pin mapentity to new version
Add background to POI icons in fixtures
Safety checks when instances have no pictograms
Add published status by lang in trek detail (ref #1003)
Add setting, control form and model save (ref #1019)
Compute altimetry on geometry save (ref #1019)
Link to zoning by intersection (ref #1019)
Fix form definition (ref #1019)
Remove debug notice (ref #1019)
Fix unit tests (ref #1019)