Thanks to Peter Klinka for the solution!

Must completely suppress notice from iconv as Behat's
shutdown function uses error_get_last() which is
unable to detect if the error was suppressed or not.

This was present in bootstrapbase and is I think an important visual
distinction.

From bs4-compat.less, replace with file level disable instead.

month is displayed in table caption which is by default in the bottom in BS4

Added a link to create a new message from the message
popup menu.