Style tweaks for question edit and preview

www/form/app-form.less

@@ -344,8 +344,6 @@
                         color: @cp_sidebar-hint;
                         margin-bottom: 10px;
                         padding: 0;
-                        text-align: center;
-                        font-weight: bold;
                     }
 
                     .cp-form-block-drag-handle {
@@ -404,6 +402,7 @@
                         .cp-form-required-radio {
                             flex-direction: row;
                             display: flex;
+                            margin-bottom: 20px;
                             span {
                                 margin-right: 10px;
                                 &.cp-radio-mark {

www/form/inner.js

@@ -87,8 +87,10 @@ define([
 
     var saveAndCancelOptions = function (cb) {
         Messages.form_preview_button = "Preview"; // XXX
-        var cancelBlock = h('button.btn.btn-secondary.cp-form-preview-button',
-                            Messages.form_preview_button);
+        var cancelBlock = h('button.btn.btn-default.cp-form-preview-button',[
+                            h('i.fa.fa-eye'),
+                            Messages.form_preview_button
+                        ]);
         $(cancelBlock).click(function () { cb(undefined, true); });
 
         return cancelBlock;