Make "previous revision" label postfix translatable

Closes #3352059

src/Entity/Paragraph.php

@@ -237,7 +237,7 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface {
       $field = $parent->get($parent_field);
       $label = $parent->label() . ' > ' . $field->getFieldDefinition()->getLabel();
       // A previous or draft revision or a deleted stale Paragraph.
-      $postfix = ' (previous revision)';
+      $postfix = $this->t('previous revision');
       foreach ($field as $value) {
         if ($value->entity && $value->entity->getRevisionId() == $this->getRevisionId()) {
           $postfix = '';
@@ -245,7 +245,7 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface {
         }
       }
       if ($postfix) {
-        $label .= $postfix;
+        $label = $label . ' (' . $postfix . ')';
       }
     }
     else {