Suppression des sauts de ligne dans la transcription, pour améliorer la navigation vocale (#2149)

* Remove br in video transcription and add description

* Summaries

* Alt without linebreaks

* Done!

* summaries

* summaries

* features

* wip

* page

* migration wip

* migration wip

* clean

* better block video

* Update app/services/migrations/turn_to_html.rb

* Update app/views/admin/application/summary/_show.html.erb

* Update app/views/admin/communication/blocks/templates/chapter/_edit.html.erb

* fix summernote config

* fix summernote translatable

* wip

* remove old blockcontent migration

* added missing migrations to summernote

* timeline

* typo

* desc

* app fix

* Fix migration

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Co-authored-by: Sébastien Gaya <sebastien.gaya@gmail.com>