enable bootstrap toasts

Author: bikubi

frontend/styles/main.scss

@@ -41,7 +41,7 @@
 @import 'bootstrap/scss/progress';
 @import 'bootstrap/scss/list-group';
 @import 'bootstrap/scss/close';
-// @import "bootstrap/scss/toasts";
+@import "bootstrap/scss/toasts";
 @import 'bootstrap/scss/modal';
 @import 'bootstrap/scss/tooltip';
 // @import "bootstrap/scss/popover";