bug symfony#17382 [TwigBridge] Use label_format option for checkbox and radio labels (enumag)

This PR was merged into the 2.8 branch.

Discussion
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[TwigBridge] Use label_format option for checkbox and radio labels

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
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6fbd9a7 [TwigBridge] Use label_format option for checkbox and radio labels

Author: fabpot

src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig

@@ -249,7 +249,14 @@
         {% set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ parent_label_class)|trim}) %}
     {% endif %}
     {% if label is empty %}
-        {% set label = name|humanize %}
+        {%- if label_format is not empty -%}
+            {% set label = label_format|replace({
+                '%name%': name,
+                '%id%': id,
+            }) %}
+        {%- else -%}
+            {% set label = name|humanize %}
+        {%- endif -%}
     {% endif %}
     <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
         {{ widget|raw }}