src/Resources/translations/SonataAdminBundle.en.xlf

<?xml version="1.0"?>
<xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">
    <file source-language="en" datatype="plaintext" original="file.ext">
        <body>
            <trans-unit id="languages_title">
                <source>languages_title</source>
                <target>Languages</target>
            </trans-unit>
        </body>
    </file>
</xliff>