Bug 1195598 - The "unknown_action" error message could confuse the user

Author: LpSolit

template/en/default/global/user-error.html.tmpl

@@ -1808,10 +1808,11 @@
     token too recently to request another. Please wait a while and try again.
 
   [% ELSIF error == "unknown_action" %]
+    [% title = "Unknown Action" %]
     [% IF action %]
-       Unknown action [% action FILTER html %]!
+      Unknown action "[% action.truncate(20, "...") FILTER html %]"!
     [% ELSE %]
-       I could not figure out what you wanted to do.
+      I could not figure out what you wanted to do.
     [% END %]
 
   [% ELSIF error == "unknown_tab" %]