Prevents console errors when that.showError doesn't exist.
fixes #2846
Replace fix with code as directed by @FinalAngel
added some new tests and minimized queries
pyflakes fix
reduces queries for publish
Merge pull request #2848 from digi604/fix-2846

fixes #2846 (deleting pages with different sub languages)
Merge pull request #2850 from digi604/fix-2802

Fix 2802 (reduces publish queries)
Merge pull request #2841 from mkoistinen/fix_2840

Prevents console errors when that.showError doesn't exist.
Merge pull request #2849 from FinalAngel/develop

Various Frontend Fixes
error not required at all, fixes #2854
fixes overflow issues
fix line positioning