feature #5313 translatable attribute values for actions (erelke)

This PR was merged into the 4.x branch.

Discussion
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translatable attribute values for actions

I added translatable attribute values for actions. (ex. if attribute value is TranslatableMessage).

```
use function Symfony\Component\Translation\t;

...

Action::new('example')->setHtmlAttributes(['title' => t('help.example')]);
```

Commits
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7bbc18d translatable attribute values for actions

src/Resources/views/crud/action.html.twig

@@ -4,12 +4,12 @@
 {% if 'a' == action.htmlElement %}
     <a class="{{ isIncludedInDropdown|default(false) ? 'dropdown-item' }} {{ action.cssClass }}"
        href="{{ action.linkUrl }}"
-       {% for name, value in action.htmlAttributes %}{{ name }}="{{ value|e('html_attr') }}" {% endfor %}>
+       {% for name, value in action.htmlAttributes %}{{ name }}="{{ (value.trans is defined ? value|trans : value)|e('html_attr') }}" {% endfor %}>
         {%- if action.icon %}<i class="action-icon {{ action.icon }}"></i> {% endif -%}
         {%- if action.label is not empty -%}<span class="action-label">{{ action.label|trans|raw }}</span>{%- endif -%}
     </a>
 {% elseif 'button' == action.htmlElement %}
-    <button class="{{ action.cssClass }}" {% for name, value in action.htmlAttributes %}{{ name }}="{{ value|e('html_attr') }}" {% endfor %}>
+    <button class="{{ action.cssClass }}" {% for name, value in action.htmlAttributes %}{{ name }}="{{ (value.trans is defined ? value|trans : value)|e('html_attr') }}" {% endfor %}>
         <span class="btn-label">
             {%- if action.icon %}<i class="action-icon {{ action.icon }}"></i> {% endif -%}
             {%- if action.label is not empty -%}<span class="action-label">{{ action.label|trans|raw }}</span>{%- endif -%}