[PLT-6710] /rename [text] slash command: Rename the channel (#6570)

* /rename [text] slash command: Rename the channel

* update strings per review

webapp/components/create_post.jsx

@@ -243,6 +243,12 @@ export default class CreatePost extends React.Component {
             return;
         }
 
+        if (!isDirectOrGroup && this.state.message.trimRight() === '/rename') {
+            GlobalActions.showChannelNameUpdateModal(updateChannel);
+            this.setState({message: ''});
+            return;
+        }
+
         this.doSubmit(e);
     }
 

webapp/components/navbar.jsx

@@ -115,6 +115,7 @@ export default class Navbar extends React.Component {
         ModalStore.addModalListener(ActionTypes.TOGGLE_QUICK_SWITCH_MODAL, this.toggleQuickSwitchModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL, this.showEditChannelHeaderModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_PURPOSE_UPDATE_MODAL, this.showChannelPurposeModal);
+        ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_NAME_UPDATE_MODAL, this.showRenameChannelModal);
         $('.inner-wrap').click(this.hideSidebars);
         document.addEventListener('keydown', this.handleQuickSwitchKeyPress);
     }
@@ -128,6 +129,7 @@ export default class Navbar extends React.Component {
         ModalStore.removeModalListener(ActionTypes.TOGGLE_QUICK_SWITCH_MODAL, this.toggleQuickSwitchModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL, this.hideEditChannelHeaderModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_PURPOSE_UPDATE_MODAL, this.hideChannelPurposeModal);
+        ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_NAME_UPDATE_MODAL, this.hideRenameChannelModal);
         document.removeEventListener('keydown', this.handleQuickSwitchKeyPress);
     }
 
@@ -218,9 +220,7 @@ export default class Navbar extends React.Component {
         });
     }
 
-    showRenameChannelModal(e) {
-        e.preventDefault();
-
+    showRenameChannelModal() {
         this.setState({
             showRenameChannelModal: true
         });