[MIG] document_page_approval: Finish migration

Changes done:
- Squash administrative commits
- Purge translations
- Remove ir.model.access.csv file
- Improve tests (change to setUpClass)
- Replace name_get() to _compute_display_name() (document_page)
- Remove readonly=1 (redudant, it already is) defined in approved_uid and approved_date fields in views
- Restore readonly=1 to the state field
- Remove duplicate Back to draft button

TT51529

document_page/security/document_page_security.xml

@@ -12,7 +12,10 @@
         <field name="name">Manager</field>
         <field name="category_id" ref="document_knowledge.module_category_knowledge" />
         <field name="implied_ids" eval="[(4, ref('group_document_editor'))]" />
-        <field name="users" eval="[(4, ref('base.user_admin'))]" />
+        <field
+            name="users"
+            eval="[(4, ref('base.user_root')), (4, ref('base.user_admin'))]"
+        />
     </record>
     <record model="ir.rule" id="document_page_rule">
         <field name="name">document_page multi-company</field>