Create Semantic UI Message
uimessage(header, content, type = "", icon, closable = FALSE)
Header of the message
Content of the message. If it is a vector, creates a list of vector's elements
Type of the message. Look at https://semantic-ui.com/collections/message.html for all possibilities.
If the message is of the type 'icon', specify the icon. Look at http://semantic-ui.com/elements/icon.html for all possibilities.
Determines whether the message should be closable. Default is FALSE - not closable