working.html: fix a typo
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<span class="card-title">Share Error Reports?</span>
<p>If you select yes the text of unexpected exceptions this add-on produces will be sent to a server
- metinained by the developer. This is completely optional, but helps give him a heads up for problems
+ maintained by the developer. This is completely optional, but helps give him a heads up for problems
with new releases and aids in providing better help messages when things go wrong. If you're unsure,
just select "No". You can always change this in the settings menu up on the top right of the page.</p>
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