[MIG][12.0] web_dashboard_tile

- refactor tile category
- improve description
- add legalsylvain as maintainer
- update code and translation

web_dashboard_tile/security/ir_rule.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<openerp>
-<data noupdate="1">
+<odoo noupdate="1">
 
     <record id="model_tile_rule" model="ir.rule">
         <field name="name">tile.owner</field>
@@ -18,5 +17,4 @@
         </field>
     </record>
 
-</data>
-</openerp>
+</odoo>