[REV] website: revert typo fix to restore translation

It was a mistake to fix this typo in stable as it would end up
invalidating all existing translations for this term.

Since it is not too late to put back the typo and therefore keep
the existing translation, we chose to partially revert cd0fa9f533f39cf4b3ad1819c659d35a3552ff68.

The typo will indeed be fixed in master.

closes odoo/odoo#107005

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/website/static/src/js/menu/edit.js

@@ -564,7 +564,7 @@ var EditPageMenu = websiteNavbarData.WebsiteNavbarActionWidget.extend({
             {
                 groupName: _t('Website'),
                 title: _t('Separator'),
-                description: _t('Insert a horizontal separator snippet.'),
+                description: _t('Insert an horizontal separator sippet.'),
                 fontawesome: 'fa-minus',
                 isDisabled: () => !this.wysiwyg.odooEditor.isSelectionInBlockRoot(),
                 callback: () => {