Display tag related to entry in current locale
As pointed out in the comments to your question, there's no need
to specify the locale with your relatedTo parameter.

I already wrote you in response to your other question, Craft always works in one locale
only if you don't explicitly make it to do otherwise.

{% for entry in entries %}

    &lt;h3&gt;{{ entry.title }}&lt;/h3&gt;

    {% for tag in craft.tags.relatedTo(entry) %}

        {{ loop.first ? '&lt;ul&gt;' }}
        &lt;li&gt;{{ tag.title }}&lt;/li&gt;
        {{ loop.last ? '&lt;/ul&gt;' }}

    {% else %}

        &lt;p&gt;No tags found&lt;/p&gt;

    {% endfor %}

{% endfor %}