Dynamic sidebar only displaying in english language.

Hi there!
I’m trying this plugin for the first time, and it looks very promising.

I’ve been stuck with this issue for some time and thought maybe someone can help.

I have this in my functions.php:

if ( function_exists('register_sidebar') )
register_sidebar(array(
  'name' => __('Footer', 'textdomain')
));

and a .po and .mo files that translate the word ‘Footer’ to another language.

But when I use this code in the template file:

dynamic_sidebar( __('Footer') );

all I get is the dynamic sidebar content for english, although the option is set to display the widget in “All languages”.

If I use this code:

dynamic_sidebar( __('Footer') );
dynamic_sidebar( __('Footer in another language') );

it works, but then I would have to add one line for every language, and if somebody should change the translation files, it would stop working.

Am I doing something wrong?
Or maybe it is a bug?

Thank you!

https://www.ads-software.com/plugins/polylang/