livechat manager fix and improvements

packages/rocketchat-livechat/app/i18n/en.i18n.json

packages/rocketchat-livechat/client/route.js

...ages/rocketchat-livechat/client/stylesheets/livechat.less

packages/rocketchat-livechat/client/ui.js

...cketchat-livechat/client/views/app/livechatDashboard.html

...etchat-livechat/client/views/app/livechatDepartments.html

...cketchat-livechat/client/views/app/livechatDepartments.js

...tchat-livechat/client/views/app/livechatInstallation.html

...ketchat-livechat/client/views/app/livechatInstallation.js

...s/rocketchat-livechat/client/views/app/livechatUsers.html

...ges/rocketchat-livechat/client/views/app/livechatUsers.js

...ocketchat-livechat/client/views/sideNav/livechatFlex.html

.../rocketchat-livechat/client/views/sideNav/livechatFlex.js

packages/rocketchat-livechat/i18n/en.i18n.json

packages/rocketchat-livechat/package.js

packages/rocketchat-ui/lib/accountBox.coffee

packages/rocketchat-ui/views/app/pageContainer.html