* Prior to this commit, Snippets XML Qweb templates files were located
  under website/static/src/xml/.

* After this commit, Snippets XML Qweb templates files will be named
  AAA.xml (with AAA being the revision number) and located under the
  related Snippet directory '/website/static/src/snippets/SNIPPET_DIRECTORY/'

task-2276740
PR #53175

Add dots indicators in gallery snippet options.

Part of https://github.com/odoo/odoo/pull/45096
task-2162952

Review the gallery snippet. It has been improved in multiple ways.
Added new options, etc.

Part of https://github.com/odoo/odoo/pull/45096
task-2162952

*: website, web_unplash

The html alt attribute is supposed to contain a description of an
image's content (an alternative to the visual representation), a lot of
snippets contained alt attributes that were not descriptive of their
content, and would as such be counter-productive in terms of
accessibility. This commit removes those.

Previously, the alt attribute on img tags had to be set manually by the
user through the editor. This commit makes use of the description field
on ir.attachment to store image description, and sets the alt attribute
on images to that description when choosing an image from the media
dialog.

task-2091417
closes odoo/odoo#45174

Related: odoo/enterprise#9520
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

In gallery snippet in carousel mode, fix the fact that the height of
the controls are bigger that the others squares and fix also the wrong
position of the indicators.

task-2162952

closes odoo/odoo#48380

X-original-commit: 9752596abfcae6b0bbf79ac675fe9e304a068a21
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

Completes https://github.com/odoo/odoo/commit/20d033a782f4d85fdd6f15df68d116b2fd7a7dfd

Closes https://github.com/odoo/odoo/pull/26077

Carousel items must now have the 'carousel-item' class.

Today, Odoo is really tricky to use without seeing the screen, it must be improved to be usable.

This PR forbid to use labels without a "for" attribute, add some title, rule and aria attributes in HTML. With that, Odoo will be fully usable with a screen reader.


* [IMP] Labels must have a for attribute. Improve accessibility.
* [IMP] Better error message when trying to read a missing cached value
* [FIX] Add some aria-label and title attributes for screen readers.
* [FIX] Template name is not included in the error message in case of SyntaxError in QWeb
* [FIX] Improve the Tour failed at step error message to be more explicit.
* [IMP] Add aria-labels
* [FIX] Add missing aria-label on failing test
* [IMP] aria-hidden means hidden. Fix all bad aria-hidden and hide aria-hidden for all.
* [IMP] Color names on kanban views and many2many tags
* [IMP] Add some checks on views for accessibility.
* [IMP] Add `alt` attribute on `img` tags.
* [IMP] Add aria-label and title on non-described icons
* [IMP] Add button role to widgets with btn class
* [IMP] Translate aria and formatted attributes.
* [IMP] Remove wrong aria-labelledby
* [IMP] Add menu role on dropdowns
* [IMP] Buttons must be focusable
* [IMP] Add aria attributes on progress bars
* [IMP] Improve accessibility of basic widgets
* [IMP] Change main layout to more semantic tags
* [IMP] Add menuitem role when missing
* [IMP] Remove wrong role='presentation'
* [IMP] Improve accessibility of tab panels
* [IMP] Add aria-invalid on invalid fields
* [IMP] Add aria-sort on ordered columns
* [IMP] Add role on alerts
* [IMP] Use dialog role, header, main and footer tags for modals
* [IMP] Add labels on o_status
* [IMP] Improve accessibility of kanban view with feeds and articles
* [IMP] Add alerts in case of new messages
* [IMP] Add widget, navigation or img role to aria-labelled items