The given code is incomplete and missing some essential parts like the logic to control visibility of processing dialog. However, I will make a few observations that might be beneficial:

• There's no way to actually confirm an action (like closing the dialog) unless the function iVisible changes on confirmation.
• We could optimize this by using CSS to change properties dynamically when visible.

Here’s what can be changed:

<div class="processing-dialog">
    <div v-if="iVisible" style="display:none;">
        <!-- Content goes here -->
        &lt;p>&ensp;{{ $t("Processing") }}</p>
        &lt;button>&ensp;&nbsp;</button>...
    </div>
</div>

This version uses dynamic CSS to hide the content until it becomes visible via v-if, which helps with reusability across different components. It provides better performance while keeping the structure clean and reusable for any component dealing with dialogs in the same context but differing use cases due to different locales or other UI styles.

If there are specific improvements based on locale data you want to utilize, remember to adapt the translation string "$tc(&&){"$lang"' "/}" within your Vue.js app to include localized text strings properly.

Remember to always update translations accordingly if localization features change in future versions!