Converted modals to Bootstrap 4 Material Design

src/web/stylesheets/vendors/bootstrap.scss

@@ -18,8 +18,6 @@ $theme-colors: (
     dark: $grey-800
 );
 
-$bmd-label-color: $green-700;
-$bmd-label-color-inner-focus: $green-500;
 $bmd-form-line-height: 1.25;
 
 @import "~bootstrap-material-design/scss/core";