compatible with the directory installation method of https://github.com/linuxserver/docker-piwigo

[LambdaExpression]

1. compatible with the directory installation method of https://github.com/linuxserver/docker-piwigo

repair error log

2024/04/09 07:22:55 [error] 327#327: *621 FastCGI sent in stderr: "PHP message: PHP Warning:  include(../../include/common.inc.php): Failed to open stream: No such file or directory in /config/www/plugins/BatchDownloader/download.php on line 3; PHP message: PHP Warning:  include(): Failed opening '../../include/common.inc.php' for inclusion (include_path='.:/usr/share/php83') in /config/www/plugins/BatchDownloader/download.php on line 3; PHP message: PHP Fatal error:  Uncaught Error: Call to undefined function check_status() in /config/www/plugins/BatchDownloader/download.php:5
Stack trace:
#0 {main}
  thrown in /config/www/plugins/BatchDownloader/download.php on line 5" while reading response header from upstream, client: 192.168.65.1, server: _, request: "GET /plugins/BatchDownloader/download.php?set_id=1&zip=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:8065", referrer: "http://127.0.0.1:8065/index.php?/category/1&action=advdown_set&down_size=original"

2. set SIZE_INFO default value

Fix the display error when size is equal to original.

3. update translate