Reformat templates

aleksis/core/templates/403.html

aleksis/core/templates/404.html

aleksis/core/templates/500.html

aleksis/core/templates/503.html

aleksis/core/templates/components/msgbox.html

aleksis/core/templates/core/base.html

aleksis/core/templates/core/data_management.html

aleksis/core/templates/core/index.html

aleksis/core/templates/core/language_form.html

aleksis/core/templates/offline.html

aleksis/core/templates/registration/logged_out.html

aleksis/core/templates/two_factor/core/setup.html