Improve I18N Issues (Based on 5.2)

I already fully localized this awesome plugin, but I found several I18N issues.

I modified the necessary code and provided a modified version for your reference.

Download here ←. Please notice, I only put modified files.

Download it and compare with the original 5.2, then you will know what I modified.

I also submit a zh_TW language pack PR to elFinder, you can use the updated zh_TW js or wait for this PR is accepted.

One of this plugin’s I18N issues, please don’t ignore it: This “Requires at least” is below 4.6. so the developer needs to set a Text Domain in file_manager_advanced.php, and it needs to be file-manager-advanced to internationalize your plugin correctly! Please refer to this article.