Modal: add support for size veryLarge (990px)

Largest so far was ‘large’ with a max-width of 740px.

app/assets/javascripts/app/controllers/_application_controller.coffee

@@ -774,6 +774,8 @@ class App.ControllerModal extends App.Controller
 
     if @container
       @el.addClass('modal--local')
+    if @veryLarge
+      @el.addClass('modal--veryLarge')
     if @large
       @el.addClass('modal--large')
     if @small

app/assets/stylesheets/zammad.scss

@@ -6208,6 +6208,9 @@ footer {
     margin: 35px auto;
   }
 }
+.modal--veryLarge .modal-dialog {
+  max-width: 990px;
+}
 .modal--large .modal-dialog {
   max-width: 740px;
 }
@@ -6286,7 +6289,7 @@ footer {
 
 .modal.modal--local {
   display: block;
-  @include bidi-style(padding-left, 40px, padding-right, 0);
+  padding: 0 40px;
 
   .modal-backdrop {
     background: hsla(210,17%,93%,.55);