fix user.name length in milestones participants tab

app/views/shared/milestones/_participants_tab.html.haml

@@ -3,6 +3,6 @@
     %li
       = link_to user, title: user.name, class: "darken" do
         = image_tag avatar_icon(user, 32), class: "avatar s32"
-        %strong= truncate(user.name, lenght: 40)
+        %strong= truncate(user.name, length: 40)
         %br
         %small.cgray= user.username