HAML using t method from model for multi languages

Question

I have a haml file which is used to translate text into multi language as below

%ul
    %li
      %a
        %i{'ng-class' => '[button.css_class]'}
        %span t ('{{button.label}}')

The button.label retreives from the model, but it did not work. If I change the code as below:

    %ul
    %li
      %a
        %i{'ng-class' => '[button.css_class]'}
        %span t ('save')

it works fine.

I need to use button.label for dynamical name.

Any approach to solve this. Thanks!