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'>

webapp/components/setting_picture.jsx

@@ -102,14 +102,14 @@ export default class SettingPicture extends Component {
         }
 
         return (
-            <ul className='section-max'>
+            <ul className='section-max form-horizontal'>
                 <li className='col-xs-12 section-title'>{this.props.title}</li>
                 <li className='col-xs-offset-3 col-xs-8'>
                     <ul className='setting-list'>
                         <li className='setting-list-item'>
                             {img}
                         </li>
-                        <li className='setting-list-item'>
+                        <li className='setting-list-item padding-top x2'>
                             <FormattedMessage
                                 id='setting_picture.help'
                                 defaultMessage='Upload a profile picture in BMP, JPG, JPEG or PNG format, at least {width}px in width and {height}px height.'
@@ -120,7 +120,11 @@ export default class SettingPicture extends Component {
                             />
                         </li>
                         <li className='setting-list-item'>
-                            <FormError errors={[this.props.clientError, this.props.serverError]}/>
+                            <hr/>
+                            <FormError
+                                errors={[this.props.clientError, this.props.serverError]}
+                                type={'modal'}
+                            />
                             <span className='btn btn-sm btn-primary btn-file sel-btn'>
                                 <FormattedMessage
                                     id='setting_picture.select'

webapp/components/user_profile.jsx

@@ -56,6 +56,11 @@ export default class UserProfile extends React.Component {
     render() {
         let name = '...';
         let profileImg = '';
+        let popoverPosition = 'right';
+        if (Utils.isMobile()) {
+            popoverPosition = 'bottom';
+        }
+
         if (this.props.user) {
             name = Utils.displayUsername(this.props.user.id);
             profileImg = Client.getUsersRoute() + '/' + this.props.user.id + '/image?time=' + this.props.user.last_picture_update;
@@ -73,7 +78,7 @@ export default class UserProfile extends React.Component {
             <OverlayTrigger
                 ref='overlay'
                 trigger='click'
-                placement='right'
+                placement={popoverPosition}
                 rootClose={true}
                 overlay={
                     <ProfilePopover