using this http://tutorials.jenkov.com/svg/switch-element.html working switch example the following exposes the title or desc as the acc name.

gistfile1.html

<svg height="50" width="500" role="img" aria-labelledby="alt">
    <switch>
        <g systemLanguage="en-UK">
            <text y="20" x="10">UK English</text>
        </g>
        <g systemLanguage="en">
            <text y="20" x="10">English</text>
        </g>       
<title id="alt">alt text</title>
    </switch>
</svg>

<!-- and -->

<svg height="50" width="500" role="img" aria-labelledby="alt">
    <switch>
        <g systemLanguage="en-UK">
            <text y="20" x="10">UK English</text>
        </g>
        <g systemLanguage="en">
            <text y="20" x="10">English</text>
        </g>
        
<desc id="alt">alt text</desc>
    </switch>
</svg>