fix plugin permissions for child plugins on apphook pages
removed duplicated code from #2875
use placeholder for permission checking in render_plugin tag
Refactored code that checks settings and dependencies
Use cms.utils.compat.dj.is_installed to check for installed apps
Check for cms.middleware.multilingual.MultilingualURLMiddleware
Fixed comment
Removed check for cms.middleware.multilingual.MultilingualURLMiddleware
Merge pull request #3360 from mmarzantowicz/feature/app_setup_refactor

Refactored code that checks settings and dependencies
fix plugin permissions for child plugins on apphook pages
removed duplicated code from #2875
use placeholder for permission checking in render_plugin tag
Merge branch 'fix/apphook-placeholder-plugin-permissions' of github.com:o-zander/django-cms into fix/apphook-placeholder-plugin-permissions

Conflicts:
	cms/templatetags/cms_tags.py
Merge pull request #3296 from o-zander/fix/apphook-placeholder-plugin-permissions

fix plugin permissions for child plugins on apphook pages
Fix typo
Merge pull request #3374 from yakky/fix_if

Fix typo