Language switcher - if url has params, hash does nothing

[npirlot]

https://github.com/servocoder/RichFilemanager/blob/873ad6683bff284e0bb76069ebd923f8deb6a94f/src/js/filemanager.js#L2206

If the manager's URI contains GET params, using the language switcher uses a hash instead of question mark. This causes the manager not to refresh (hash change does not generate page reload), and language is not changed.

Should the hash not be replaced by an ampersand?