muk_web/muk_web_theme_mail/template/assets.xml

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

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	Copyright (C) 2017 MuK IT GmbH
	
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<odoo>
	
	<template id="assets_backend" name="Backend Assets" inherit_id="web.assets_backend">
		<xpath expr="//link[last()]" position="after">
            <link rel="stylesheet" type="text/scss" href="/muk_web_theme_mail/static/src/scss/chatter.scss"/>
		</xpath>
		<xpath expr="//script[last()]" position="after">
            <script type="text/javascript" src="/muk_web_theme_mail/static/src/js/chatter.js" />
		</xpath>
	</template>
	
</odoo>