Migrate to bootstrap 4 in LeafWeb

WebCms/Views/Shared/EditorTemplates/_FieldLayout.cshtml

@@ -12,40 +12,7 @@
     var hasErrorClass = hasError ? "has-error" : string.Empty;
 }
 <div class="form-group @lowerPropertyName @hasErrorClass">
-    @Html.LabelForModel(new { @class = "control-label" })
+    @Html.LabelForModel()
     @RenderBody()
-    @Html.ValidationMessage("", new { @class = "help-block"})
+    @Html.ValidationMessage("", new { @class = "form-text"})
 </div>
-
-
-@*<div class="form-group @lowerPropertyName">
-        @if (editLabel)
-        {
-            @Html.LabelForModel()
-        }
-        <div class="input-group">
-            @if (!string.IsNullOrEmpty(units))
-            {
-                <div class="input-append">
-                    @RenderBody()
-                    <span class="add-on">@units</span>
-                </div>
-            }
-            else if (!string.IsNullOrEmpty(currency))
-            {
-                <div class="input-prepend">
-                    <span class="add-on">@currency</span>
-                    @RenderBody()
-                </div>
-            }
-            else
-            {
-                @RenderBody()
-            }
-            @if (!string.IsNullOrEmpty(formatHint))
-            {
-                <div><small><em>@formatHint</em></small></div>
-            }
-            <span class="help-block">@Html.ValidationMessage("")</span>
-        </div>
-    </div>*@