Change "Please register or login" to "Please sign up or sign in"

Now this is more consistent with the rest of the app.

app/views/projects/notes/_notes_with_form.html.haml

@@ -14,9 +14,9 @@
       .disabled-comment.text-center
         .disabled-comment-text.inline
           Please
-          = link_to "register", new_session_path(:user, redirect_to_referer: 'yes')
+          = link_to "sign up", new_session_path(:user, redirect_to_referer: 'yes')
           or
-          = link_to "login", new_session_path(:user, redirect_to_referer: 'yes')
+          = link_to "sign in", new_session_path(:user, redirect_to_referer: 'yes')
           to post a comment
 
 :javascript