strip javascript in previews

...admin/communication/blocks/components/code/_show.html.erb

app/views/admin/communication/blocks/content/_show.html.erb

app/views/admin/communication/blocks/headings/_show.html.erb

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

...communication/extranets/posts/categories/preview.html.erb

...iews/admin/communication/extranets/posts/preview.html.erb

...views/admin/communication/websites/pages/preview.html.erb

...views/admin/communication/websites/posts/preview.html.erb

app/views/admin/education/programs/preview.html.erb

app/views/extranet/posts/posts/show.html.erb

config/locales/communication/contents/en.yml

config/locales/communication/contents/fr.yml