Improve flash messages

* dont fadeout so user can read
* show inside content block so user can notice it

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'improve-flash-message' into 'master'

Improve flash message

* dont fadeout so user can read
* show inside content block so user can notice it

See merge request !1119