yaltik_odoo_custom/yaltik_crm_action/views/res_partner_views.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
Copyright 2017 Fabien Bourgeois <fabien@yaltik.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->

<odoo>
  <data>

    <!-- Form -->
    <record id="crm_view_partners_form_inherit_yaltik_crm_action"
      model="ir.ui.view">
      <field name="name">CRM Partner form adaptations</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="crm.view_partners_form_crm1" />
      <field name="arch" type="xml">
        <button icon="fa-clock-o" position="replace">
          <button class="oe_stat_button" type="object"
            name="partner_actions" icon="fa-clock-o">
            <field string="Actions" name="action_count" widget="statinfo" />
          </button>
        </button>
      </field>
    </record>

    <!-- Overwrite actity opening -->
    <delete id="crm.crm_activity_report_action_tree" model="ir.actions.act_window" />
    <record model="ir.actions.server" id="crm.crm_activity_report_action_tree">
      <field name="name">Actions</field>
      <field name="model_id" ref="model_crm_action" />
      <field name="state">code</field>
      <field name="code">action = self.partner_actions()</field>
    </record>

  </data>
</odoo>