[REF] web: base.xml: remove unused template
[REF] web: base.xml: remove unused template

Also clean the 'UserMenu.about' template (remove unnecessary classnames), and
fix version name.

ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,ygol/odoo,dfang/odoo,dfang/odoo,ygol/odoo,ygol/odoo