added back hide button for rooms and history page link

client/stylesheets/base.less

client/views/app/sideNav/channels.html

client/views/app/sideNav/chatRoomItem.html

client/views/app/sideNav/directMessages.html

client/views/app/sideNav/privateGroups.html

client/views/app/sideNav/sideNav.html

client/views/app/sideNav/starredRooms.html

i18n/en.i18n.json

i18n/pt.i18n.json