Cleanup: Remove unused imports
Cleanup: Use decorator to register template filter
Cleanup: simplified condition
Cleanup: removed unnecessary extra variable
Cleanup: removed page zoom feature

Conflicts:
	docs/upstream_differences.rst
	pootle/static/css/editor.css
	pootle/static/css/style.css
	pootle/static/js/README
	pootle/templates/layout.html
Docs: Add missing items to release notes