Minor Make the blocked users nav menu item the last item in the menu.
In the message settings page there is a table used for layout. There shouldnt be.
Make the search box smaller.
When viewing the messaging history between you and another user visually indicate which user is currently selected in the contacts/participants list.
Remove the "new search" button
Remove the search term from the search results page. only appears when there are no matches.
The search button below the contacts list shouldnt display when the search itself is visible.
make sure strings in messages are being inserted in the message recipient's language.