Nouveau bloc liens (#1889)

app/assets/images/communication/blocks/templates/links.jpg

app/models/communication/block.rb

app/models/communication/block/template/link.rb

app/models/communication/block/template/link/element.rb

...admin/communication/blocks/templates/files/_show.html.erb

...admin/communication/blocks/templates/links/_edit.html.erb

...admin/communication/blocks/templates/links/_show.html.erb

...in/communication/blocks/templates/links/_snippet.html.erb

...min/communication/blocks/templates/links/_static.html.erb

config/locales/communication/contents/en.yml

config/locales/communication/contents/fr.yml