* add a system_font_ui setting on the server
* Plug the system_font_ui on the front-end
* add EN/FR locales for the new setting
* put Roboto after all other fonts
* remove trailing whitespace so CodeClimate is happy
* fix user_spec.rb
* correctly write user_spect this time
* slightly better way of adding the classes
* add comments to the system-font stack for clarification
* use .system-font for the class instead
* don't use multiple lines for comments
* remove trailing whitespace
* use the classnames module for consistency
* use `mastodon-font-sans-serif` instead of Roboto directly
* add missing locales for French translation
* accent "Media" in the front-end locales
* images => médias
* Change 'rapport' to 'signalement' in French locales to be more coherent
* fix typo
* remove duplicate EN locale
* translate missing locales
* update missing locale
* fix typo
* unify with "utilisateur⋅ice⋅s"
* address PR comments
* Add FR locale for the onboarding modal component
* Slightly increase the max-width and max-height of the onboarding modal
This is done so it doesn't break with locales whose strings would be
too long
* Update FR locales for onboarding upon PR comments
Damien Erambert