Use the same composed action method for update, since if there isn't
already a description with the given name, it will add it.
Revert "Use the same composed action method for update, since
it did not properly cater for filling the form with the right
id data to update the particular description properly, and ended
up adding one instead.

This reverts commit 1e954f59628dbef9027aa7d07c9eff42b361f7d5.
Fix flash message
Ensure item id is present in POST data
Remove unnecessary item fetch and fix formatting