我也是法国人，但我必须用英语回答。您需要使用wp\\u localize\\u script（），它允许在js脚本中处理本地化。

add_action(\'wp_enqueue_scripts\', \'load_script\');
function load_script(){
    wp_register_script( \'popup\', plugins_url(\'yourscript/js/yourjs.js\'), array( \'jquery\' ), false, true );
    wp_localize_script(
        \'popup\',
        \'popUp\',
        array(
            \'popupTitle\'=> __(\'\', \'your-text-domain)
        )
    );
    wp_enqueue_script(\'popup\');
}

在js文件中，您将能够检索值：

function save_image($id){
    var mediaUploader;
    event.preventDefault();

    // If the uploader object has already been created, reopen the dialog
    if (mediaUploader) {
        mediaUploader.open();
        return;
    }

    // Extend the wp.media object
    var popupTitle = popUp.popupTitle;

    mediaUploader = wp.media.frames.file_frame = wp.media({
        title: popupTitle,
        button: {
            text: popupTitle
        },
        multiple: false,
        type: \'image\'
    });

    // When a file is selected, grab the URL and set it as the text field\'s value
    mediaUploader.on(\'select\', function() {
        attachment = mediaUploader.state().get(\'selection\').first().toJSON();
    });

    // Open the uploader dialog
    mediaUploader.open();
}

https://codex.wordpress.org/Function_Reference/wp_localize_script

您可以安装插件WordPress Media Javascript指南。它通过屏幕截图和示例说明了wp必须使用的方法。媒体对象。

只需一个片段即可更改按钮文本和标题：

wp_register_script( \'media-bbss-uploader-js\', BBSSLIDERS_DIR_URL .\'/js/bbss-multiple-media-upload.js\', array(\'jquery\') );
wp_localize_script(
    \'media-bbss-uploader-js\',
    \'screenHelp\',
    array(
        \'title\' => __(\'Select or upload new slides\', $this->plugin_text_domain),
        \'buttomText\' => __(\'Add slides\', $this->plugin_text_domain),
    )
);
wp_enqueue_script( \'media-bbss-uploader-js\' );