initLanguage should use short message format?

[maxxer]

Prerequisites

• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• The issue still exists against the latest master branch of yii2-widget-fileinput.
• This is not an usage question. I confirm having read the widget documentation and demos.
• This is not a general programming / coding question. (Those should be directed to the webtips Q & A forum).
• This is not a source plugin (fileinput) issue. (Those should be directed to the plugin issues repo).
• I have attempted to find the simplest possible steps to reproduce the issue.
• I have included a failing test as a pull request (Optional).

Steps to reproduce the issue

            <?= FileInput::widget([
                'model' => $model,
                'attribute' => 'attachments[]',
                'options' => ['multiple' => true],
            ]) ?>

Expected behavior and actual behavior

According to the code, plugin language is set automatically using Yii::$app->language property, but this
doesn't work. language widget property must be set explicitly to the short ISO code in order to translate
the widget.

A simple change in FileInput::initWidget() would allow automatic language selection.

        $this->initLanguage('language', false);

Setting the short message format will load the correct language.

Environment

Browsers

• Google Chrome
• Mozilla Firefox
• Internet Explorer
• Safari

Operating System

• Windows
• Mac OS X
• Linux
• Mobile

Libraries

• jQuery version: v3.6.4
• yii2-widget-fileinput version: v1.1.1

Isolating the problem

• This bug happens on the widget demos page
• The bug happens consistently across all tested browsers
• This bug happens when using yii2-widget-fileinput without other plugins
• I can reproduce this bug in a jsbin