use treeview helper
switch to Fira Sans, clean up sass
implement preliminary mockup for concept teasers
add autoprefixr-rails
disable small caps for list group items for now
fix headline semantics in teaser modal
fix button markup
increase base font size
use lighter variants of Fira throughout
reset base font size, extract small caps to mixin
fix label-list styling
add more nil checks
tweak padding
labels won't be grouped by language
render sections only if there's any content
tweak modal styling
fix load order of sass import
move body style to it's correct place
tweak base font weight
be a bit more strict when it comes to frontend deps