Summernote was updated alongside the new editor of saas-12.2. However,
since we are putting back the editor of 12.0, summernote needs to be
downgraded back to the version that was compatible with the 12.0 editor.

This is a revert of 17c6d005.

Part of PR 35677.

Co-authored-by: Nicolas Bayet <nby@odoo.com>
Co-authored-by: Antoine Guenet <age@odoo.com>
Co-authored-by: Christophe Matthieu <chm@odoo.com>
Co-authored-by: David Monjoie <dmo@odoo.com>

The refactoring of the wysiwyg editor and 'html' field allow for the
update of the Summernote library.

Completes commit https://github.com/odoo/odoo/commit/2d5595fcbad73ed0ce03f048fdd870d9659bcd5e

Close icon should now be put after the modal title in the DOM.
Completes commit https://github.com/odoo/odoo/commit/d9801c1abe06b4c20702c0e94c56eea6a3ed8327

The big plan is to remove our current editor and its customization and
replace it with an updated summernote. Meanwhile, we have to patch our
current lib directly so that it works with BS4.

'img-rounded' -> 'rounded'
'img-circle' -> 'rounded-circle'

col-lg-* -> col-xl-*
col-md-* -> col-lg-*
col-sm-* -> col-md-*
col-xs-* -> col-*

col-lg-offset-* -> offset-xl-*
col-md-offset-* -> offset-lg-*
col-sm-offset-* -> offset-md-*
col-xs-offset-* -> offset-*

col-lg-pull-* -> order-xl-1
col-md-pull-* -> order-lg-1
col-sm-pull-* -> order-md-1
col-xs-pull-* -> order-1

col-lg-push-* -> order-xl-2
col-md-push-* -> order-lg-2
col-sm-push-* -> order-md-2
col-xs-push-* -> order-2

BS4 "btn-default" class was replaced with "btn-secondary", which makes
more sense.

- JS Modals were not correctly built anymore, their .modal-body element
  was duplicated and many without-effect JS lines were introduced (as a
  side effect, the form view design was broken when inside modals)

- Tests were changed to make bugs go unnoticed. For example, the media
  dialog functionnality was entirely broken because the .modal-dialog
  element was not receiving the correct class anymore.

- The JS translation function is _t, not _

- Do not use the <title/> tag as a regular DOM element, it is meant to
  be unique, in the <head/> section

- CSS rules were added to the utils.scss file, which is meant to contain
  functions and mixins, otherwise, the rule is duplicated in every asset

- Some icons were still broken, as missed by https://github.com/odoo/odoo/commit/f90cf060a3cfeb37a67bec83264c0aaab8892b56

- Tests were changed to use [role="dialog"]/footer/header in their
  selectors without any reason, this commit restores some of that to
  avoid rebase conflicts with the BS4 work.

- ...

Note: other elements should still be discussed, like the direct use of
the 'o_form_label' class in views definition... but those do not cause
direct problems.