This is a simple renaming without adaptation.

* web, web_editor, website, im_livechat

* test_main_flows

The style of a primary/link button is given by the
'btn-primary'/'btn-link' class. The old 'oe_highlight'/'oe_link'
class should still be supported in views but not rendered in the DOM.

This was introduced as a fix for grouped list views' headers while we
should have added the 'o_list_number' class instead... which is the
case now. So the oe_number rule became useless.

See https://github.com/odoo/enterprise/commit/a2ce226a2a085b26174cdfd32922517dff39658c
See https://github.com/odoo/odoo/commit/5d13a2f431e1c96e075b04d0eb07d98b912a6547
See https://github.com/odoo/odoo/pull/23966

Issue: when displaying the shortcuts with ALT key, when a dialog is open
the shortcuts are displayed in absolute position above the gray overlay
of the dialog, so it is possible to click on the buttons of the
shortcuts.
This fix will remove this possibility.

Before this rev., the datepicker could only be opened by clicking
on the input, not on its caret.

OPW 1836520

In Less, the size_class XL is now defined and can be used in media-queries.
It is also added in JS for the sake of consistency.

This new size is needed for a fix in enterprise.