<div id="hotspot_{{name}}_overlay" class="hotspot overlay" data-overlay="hotspot_{{name}}_overlay">
    <div class="hotspot-popover">
        <div class="hotspot-popover-top">
            <h1 class="hotspot-title">{{title}}</h1>
        </div>
        <div class="hotspot-popover-content">
            <p class="hotspot-description">{{description}}</p>
        </div>
        <div class="hotspot-popover-bottom">
            <img class="hotspot-img" alt=_("hotspot illustration") src="{{img}}" />
            <button class="hotspot-confirm">{{t 'Got it!' }}</button>
        </div>
    </div>
</div>

<div id="hotspot_{{name}}_overlay" class="hotspot overlay" data-overlay="hotspot_{{name}}_overlay">
    <div class="hotspot-popover">
        <div class="hotspot-popover-top">
            <h1 class="hotspot-title">{{title}}</h1>
        </div>
        <div class="hotspot-popover-content">
            <p class="hotspot-description">{{description}}</p>
        </div>
        <div class="hotspot-popover-bottom">
            <img class="hotspot-img" src="{{img}}" />
            <button class="hotspot-confirm">{{t 'Got it!' }}</button>
        </div>
    </div>
</div>

Remove useless and malformed alt text.
hotspots: Remove useless and malformed alt text.

Since it was introduced in 5ce0db9f433a6dcf7beea42b295f00e27d060933,
we've had alt text for the hotspots illustration with an invalid
translation tag.

Fix this by removing the alt text, since the image has no functional
effect and so the right answer should it fail to load or the user is
visually impaired is to ignore it.
