Cleanup: PEP8 and coding style fixes

Pick notes: The rest of the changes are not necessary.

Conflicts:
	pootle/apps/pootle_language/views.py
	pootle/apps/pootle_misc/browser.py
	pootle/apps/pootle_misc/stats.py
	pootle/apps/pootle_project/views.py
	pootle/apps/pootle_store/forms.py
	pootle/apps/pootle_store/models.py
	pootle/apps/pootle_translationproject/views.py
	pootle/static/css/style.css
Cleanup: removed unused variables

Pick notes: The rest of the changes were already done on our code before.

Conflicts:
	pootle/apps/pootle_store/views.py