Minor bug and UI fixes (#6729)

* PLT-6797 - Code block language tag not selectable

* PLT-6771 - Aligning search box with RHS

* PLT-6827 - Fixing link color in error bar

* PLT-6241 - Adding edge detection

webapp/components/channel_view.jsx

@@ -44,7 +44,7 @@ export default class ChannelView extends React.Component {
         $('body').addClass('app__body');
 
         // IE Detection
-        if (UserAgent.isInternetExplorer()) {
+        if (UserAgent.isInternetExplorer() || UserAgent.isEdge()) {
             $('body').addClass('browser--ie');
         }
     }

webapp/components/new_channel_modal/new_channel_modal.jsx

@@ -112,7 +112,7 @@ export default class NewChannelModal extends React.PureComponent {
 
     componentDidMount() {
         // ???
-        if (UserAgent.isInternetExplorer()) {
+        if (UserAgent.isInternetExplorer() || UserAgent.isEdge()) {
             $('body').addClass('browser--ie');
         }
     }

webapp/components/search_bar.jsx

@@ -255,7 +255,6 @@ export default class SearchBar extends React.Component {
             mentionBtn = (
                 <div
                     className='dropdown channel-header__links'
-                    style={{float: 'left', marginTop: '1px'}}
                 >
                     <OverlayTrigger
                         delayShow={Constants.OVERLAY_TIME_DELAY}
@@ -279,7 +278,6 @@ export default class SearchBar extends React.Component {
             flagBtn = (
                 <div
                     className='dropdown channel-header__links'
-                    style={{float: 'left', marginTop: '1px'}}
                 >
                     <OverlayTrigger
                         delayShow={Constants.OVERLAY_TIME_DELAY}