Support icons and namespaced URLs in dashboard nav again

Fixes #967
Merge remote-tracking branch 'origin/issue/967/dashboardnav'
Merge branch 'master' of https://github.com/tangentlabs/django-oscar
Russioan translation pulled from Transifex
Russian translation added from Transifex
Merge branch 'master' of https://github.com/tangentlabs/django-oscar

Conflicts:
	oscar/apps/dashboard/nav.py
Merge branch 'master' of https://github.com/tangentlabs/django-oscar
Merge branch 'master' of https://github.com/tangentlabs/django-oscar
Fix demo-site nav_accounts template to display dashboard link for special users.
Trying to fix issue with AJAX product lookup at creation page (403 for user without permissions)
Merge remote-tracking branch 'okfish/fix/perms_dashboard_adjustments'
Russian locale added
mo file added