Merge branch 'fix/award-emoji-alert-width' into 'master'

Fix award-emojis alert flash message

This adds a new feature to `Flash` that allows to pin it after a
specified selector. This removes a fixed position from such award-emoji
alert, and makes it responsive by design of selector that this alert is
pinned to.

Closes #3996

\cc @vsizov 

See merge request !2065