fix tag display / filtering

district/forms.py

...71_districtarticlespage_displayed_shared_tags_and_more.py

district/models.py

...4_electionsarticlespage_displayed_shared_tags_and_more.py

elections/models.py

...s/0114_mainarticlespage_displayed_shared_tags_and_more.py

main/models.py

shared/forms.py

shared/models/main.py

shared/templates/styleguide2/includes/atoms/tags/tag.html

...includes/molecules/articles/article_timeline_preview.html

...d/templates/styleguide2/includes/molecules/tags/tags.html

shared/templatetags/shared_filters.py

...uniwebarticlesindexpage_displayed_shared_tags_and_more.py

uniweb/models.py