Merge pull request #2387 from javaning/develop

add or fix input tips when create a channel

packages/rocketchat-ui-sidenav/side-nav/createChannelFlex.coffee

 Template.createChannelFlex.helpers
+	tRoomMembers: ->
+		return t('Members_placeholder')
+	
 	selectedUsers: ->
 		return Template.instance().selectedUsers.get()
 

packages/rocketchat-ui-sidenav/side-nav/privateGroupsFlex.coffee

 Template.privateGroupsFlex.helpers
+	tRoomMembers: ->
+		return t('Members_placeholder')
+	
 	selectedUsers: ->
 		return Template.instance().selectedUsers.get()