odoo/addons/auth_signup/static/src/xml/auth_signup.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- vim:fdl=1: -->
<templates id="template" xml:space="preserve">

    <t t-extend="Login">
        <t t-jquery="form ul:first li:contains('Username')" t-operation="before">
            <li class="oe_signup_show">Name</li>
            <li class="oe_signup_show"><input name="name" type="text"/></li>
        </t>
        <t t-jquery="form ul:first li:contains('Username')" t-operation="replace">
            <li class="oe_signup_hide">Username</li>
            <li class="oe_signup_show">Username (Email)</li>
        </t>
        <t t-jquery="form ul:first li:has(input[name=password])" t-operation="after">
            <li class="oe_signup_show">Confirm Password</li>
            <li class="oe_signup_show"><input name="confirm_password" type="password"/></li>
        </t>
        <t t-jquery="form ul:first li:has(button[name=submit])" t-operation="replace">
            <li class="oe_signup_hide"><button name="submit">Log in</button></li>
            <li class="oe_signup_show"><button name="submit">Sign in</button></li>
        </t>
        <t t-jquery="form ul:first li:last" t-operation="after">
            <li><a class="oe_signup_hide oe_signup_signup" href="#">Sign Up</a></li>
            <li><a class="oe_signup_show oe_signup_back" href="#">Back to Login</a></li>
        </t>
    </t>

</templates>