otherActionButtons: {downloadUrl} not replaced with downloadUrl

[jokamax]

Steps to reproduce the issue

I use otherActionButtons in my widget. {dataKey} no problem. {caption} no problem. But impossible to use {downloadUrl} => not replaced

My code :

$btns = '<button type="button" class="kv-cust-btn btn btn-default" title="Utiliser en tant qu\'avatar"{dataKey}>' .
    '<i class="fas fa-user-astronaut"></i>{downloadUrl}' .
    '</button>';
// your fileinput widget for single file upload
echo $form->field($model, 'file')->widget(FileInput::classname(), [
    'options'=>['accept'=>'image/*'],
    'pluginOptions' => [
                'deleteUrl' => 'file/delete',
                'allowedFileExtensions'=>['jpg', 'jpeg', 'gif','png'],
                'previewFileType' =>  "image",

                'initialPreview'=>[
                    "http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/FullMoon2010.jpg/631px-FullMoon2010.jpg",
                    "http://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Earth_Eastern_Hemisphere.jpg/600px-Earth_Eastern_Hemisphere.jpg"
                ],
                'initialPreviewAsData'=>true,
                'initialCaption'=>"Cliquez sur parcourir pour ajouter un avatar, puis transférer...",
                'initialPreviewConfig' => [
                    ['caption' => 'Moon.jpg', 'size' => '873727', 'key' => '1', 
                    'downloadUrl' =>  "http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/FullMoon2010.jpg/631px-FullMoon2010.jpg"],
                    ['caption' => 'Earth.jpg', 'size' => '1287883', 'key' => '2' ,
                    'downloadUrl'=> "http://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Earth_Eastern_Hemisphere.jpg/600px-Earth_Eastern_Hemisphere.jpg"],
                ],
                'overwriteInitial'=>false,
                'maxFileSize'=>100,
                'otherActionButtons' => $btns,
            ]
])->label(false);

Result display "{downloadUrl}". Test is dirty only for testing purpose ;)

Expected behavior and actual behavior

When I follow those steps, I see...

I was expecting...

Environment

Browsers

• [X ] Mozilla Firefox

Operating System

• [ X] Windows

Libraries

• jQuery version: 3.2.1
• yii2-widget-fileinput version: Version 1.0.9

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