Conflicts:
app/javascript/styles/mastodon-light.scss
config/locales/en.yml
config/locales/fr.yml
config/locales/simple_form.pl.yml
config/themes.yml
Conflicts resolved by deleting config/themes.yml,
marking app/javascript/styles/mastodon-light.scss as added,
and taking all new translation strings, not removing anything from
them.