Add macros and use them

app/corpora/views.py

app/models.py

app/static/js/nopaque.js

app/templates/admin/edit_user.html.j2

app/templates/auth/login.html.j2

app/templates/auth/register.html.j2

app/templates/auth/reset_password.html.j2

app/templates/auth/reset_password_request.html.j2

app/templates/corpora/add_corpus.html.j2

app/templates/corpora/add_corpus_file.html.j2

app/templates/corpora/analyse_corpus.html.j2

app/templates/corpora/edit_corpus_file.html.j2

app/templates/macros.jinja

app/templates/main/feedback.html.j2

app/templates/main/index.html.j2

app/templates/main/poster.html.j2

app/templates/materialize.jinja

app/templates/nopaque.html.j2

app/templates/profile/settings.html.j2

app/templates/services/file-setup.html.j2