python3: use relative imports (#39092)

welco/views.py

@@ -38,9 +38,9 @@ try:
 except ImportError:
     get_idps = lambda: []
 
-from sources.mail.views import Home as MailHome
-from sources.phone.views import Home as PhoneHome
-from sources.counter.views import Home as CounterHome
+from .sources.mail.views import Home as MailHome
+from .sources.phone.views import Home as PhoneHome
+from .sources.counter.views import Home as CounterHome
 from .qualif.models import Association
 from .kb.views import HomeZone as KbHomeZone, check_user_perms as check_kb_user_perms
 from .contacts.views import HomeZone as ContactsHomeZone