Ui improvements (#6651)

* PLT-6691 - Centering emoji in post view

* PLT-6737 - FIxing on hover style for heade icons

* PLT-6768 - Fixing error on profile picture

* PLT-6792 - Fixing link preview image not resizing

* PLT-6793 - User popover position on mobile

webapp/components/form_error.jsx

@@ -43,6 +43,16 @@ export default class FormError extends React.Component {
             return null;
         }
 
+        if (this.props.type === 'modal') {
+            return (
+                <div className='form-group'>
+                    <label className='col-sm-12 has-error'>
+                        {message}
+                    </label>
+                </div>
+            );
+        }
+
         if (this.props.type === 'backstage') {
             return (
                 <div className='pull-left has-error'>