diff --git a/src/ejabberd_web_admin.erl b/src/ejabberd_web_admin.erl
index 3511b32df..271a5a37c 100644
--- a/src/ejabberd_web_admin.erl
+++ b/src/ejabberd_web_admin.erl
@@ -930,7 +930,7 @@ user_info(User, Server, Query, Lang) ->
 			 end;
 		     _ -> translate:translate(Lang, ?T("Online"))
 		   end,
-    [?XC(<<"h1">>, (str:format(translate:translate(Lang, ?T("User ~ts")),
+    [?XC(<<"h1">>, (str:translate_and_format(Lang, ?T("User ~ts"),
                                                 [us_to_list(US)])))]
       ++
       case Res of
@@ -1087,7 +1087,7 @@ get_node(global, Node, [], Query, Lang) ->
     Base = get_base_path(global, Node, 2),
     MenuItems2 = make_menu_items(global, Node, Base, Lang),
     [?XC(<<"h1">>,
-	 (str:format(translate:translate(Lang, ?T("Node ~p")), [Node])))]
+	 (str:translate_and_format(Lang, ?T("Node ~p"), [Node])))]
       ++
       case Res of
 	ok -> [?XREST(?T("Submitted"))];
@@ -1109,7 +1109,7 @@ get_node(global, Node, [], Query, Lang) ->
 get_node(Host, Node, [], _Query, Lang) ->
     Base = get_base_path(Host, Node, 4),
     MenuItems2 = make_menu_items(Host, Node, Base, Lang),
-    [?XC(<<"h1">>, (str:format(translate:translate(Lang, ?T("Node ~p")), [Node]))),
+    [?XC(<<"h1">>, (str:translate_and_format(Lang, ?T("Node ~p"), [Node]))),
      ?XE(<<"ul">>, MenuItems2)];
 get_node(global, Node, [<<"db">>], Query, Lang) ->
     case ejabberd_cluster:call(Node, mnesia, system_info, [tables]) of
@@ -1165,7 +1165,7 @@ get_node(global, Node, [<<"db">>], Query, Lang) ->
 			   end,
 			   STables),
 	  [?XC(<<"h1">>,
-	       (str:format(translate:translate(Lang, ?T("Database Tables at ~p")),
+	       (str:translate_and_format(Lang, ?T("Database Tables at ~p"),
                                             [Node]))
 	  )]
 	    ++
@@ -1203,7 +1203,7 @@ get_node(global, Node, [<<"backup">>], Query, Lang) ->
 		 [?XRES(<<(translate:translate(Lang, ?T("Error")))/binary, ": ",
 			  ((str:format("~p", [Error])))/binary>>)]
 	   end,
-    [?XC(<<"h1">>, (str:format(translate:translate(Lang, ?T("Backup of ~p")), [Node])))]
+    [?XC(<<"h1">>, (str:translate_and_format(Lang, ?T("Backup of ~p"), [Node])))]
       ++
       ResS ++
 	[?XCT(<<"p">>,
@@ -1357,7 +1357,7 @@ get_node(global, Node, [<<"stats">>], _Query, Lang) ->
     TransactionsLogged = ejabberd_cluster:call(Node, mnesia, system_info,
 				  [transaction_log_writes]),
     [?XC(<<"h1">>,
-	 (str:format(translate:translate(Lang, ?T("Statistics of ~p")), [Node]))),
+	 (str:translate_and_format(Lang, ?T("Statistics of ~p"), [Node]))),
      ?XAE(<<"table">>, [],
 	  [?XE(<<"tbody">>,
 	       [?XE(<<"tr">>,
@@ -1425,7 +1425,7 @@ get_node(global, Node, [<<"update">>], Query, Lang) ->
     FmtLowLevelScript = (?XC(<<"pre">>,
 			     (str:format("~p", [LowLevelScript])))),
     [?XC(<<"h1">>,
-	 (str:format(translate:translate(Lang, ?T("Update ~p")), [Node])))]
+	 (str:translate_and_format(Lang, ?T("Update ~p"), [Node])))]
       ++
       case Res of
 	ok -> [?XREST(?T("Submitted"))];
diff --git a/src/mod_configure.erl b/src/mod_configure.erl
index 71c411979..adc97f114 100644
--- a/src/mod_configure.erl
+++ b/src/mod_configure.erl
@@ -663,7 +663,7 @@ get_outgoing_s2s(Host, Lang) ->
 		    Host == FH orelse str:suffix(DotHost, FH)],
     lists:map(
       fun (T) ->
-	      Name = str:format(tr(Lang, ?T("To ~ts")),[T]),
+	      Name = str:translate_and_format(Lang, ?T("To ~ts"),[T]),
 	      #disco_item{jid = jid:make(Host),
 			  node = <<"outgoing s2s/", T/binary>>,
 			  name = Name}
@@ -675,7 +675,7 @@ get_outgoing_s2s(Host, Lang, To) ->
     lists:map(
       fun ({F, _T}) ->
 	      Node = <<"outgoing s2s/", To/binary, "/", F/binary>>,
-	      Name = str:format(tr(Lang, ?T("From ~ts")), [F]),
+	      Name = str:translate_and_format(Lang, ?T("From ~ts"), [F]),
 	      #disco_item{jid = jid:make(Host), node = Node, name = Name}
       end,
       lists:keysort(
diff --git a/src/mod_muc_room.erl b/src/mod_muc_room.erl
index 2a6bc4838..dbabbc0d4 100644
--- a/src/mod_muc_room.erl
+++ b/src/mod_muc_room.erl
@@ -1444,7 +1444,8 @@ get_error_text(#stanza_error{text = Txt}) ->
 make_reason(Packet, From, StateData, Reason1) ->
     #user{nick = FromNick} = maps:get(jid:tolower(From), StateData#state.users),
     Condition = get_error_condition(xmpp:get_error(Packet)),
-    str:format(Reason1, [FromNick, Condition]).
+    Reason2 = unicode:characters_to_list(Reason1),
+    str:format(Reason2, [FromNick, Condition]).
 
 -spec expulse_participant(stanza(), jid(), state(), binary()) ->
 				 state().
@@ -3493,8 +3494,8 @@ get_config(Lang, StateData, From) ->
     DefaultRoomMaxUsers = get_default_room_maxusers(StateData),
     Config = StateData#state.config,
     MaxUsersRoom = get_max_users(StateData),
-    Title = str:format(
-	      translate:translate(Lang, ?T("Configuration of room ~s")),
+    Title = str:translate_and_format(
+	      Lang, ?T("Configuration of room ~s"),
 	      [jid:encode(StateData#state.jid)]),
     Fs = [{roomname, Config#config.title},
 	  {roomdesc, Config#config.description},
diff --git a/src/mod_offline.erl b/src/mod_offline.erl
index 1cc790de0..9746036e5 100644
--- a/src/mod_offline.erl
+++ b/src/mod_offline.erl
@@ -988,7 +988,7 @@ user_queue(User, Server, Query, Lang) ->
 	      end,
     Hdrs = get_messages_subset(User, Server, HdrsAll),
     FMsgs = format_user_queue(Hdrs),
-    PageTitle = str:format(translate:translate(Lang, ?T("~ts's Offline Messages Queue")), [us_to_list(US)]),
+    PageTitle = str:translate_and_format(Lang, ?T("~ts's Offline Messages Queue"), [us_to_list(US)]),
     (?H1GL(PageTitle, <<"modules/#mod-offline">>, <<"mod_offline">>))
       ++ [?XREST(?T("Submitted"))] ++
 	[?XAE(<<"form">>,
diff --git a/src/mod_register.erl b/src/mod_register.erl
index 432b8421a..cf125db78 100644
--- a/src/mod_register.erl
+++ b/src/mod_register.erl
@@ -222,8 +222,7 @@ process_iq(#iq{type = get, from = From, to = To, id = ID, lang = Lang} = IQ,
 		       "with this server")),
     URL = mod_register_opt:redirect_url(Server),
     if (URL /= undefined) and not IsRegistered ->
-	    Txt = translate:translate(Lang, ?T("To register, visit ~s")),
-	    Desc = str:format(Txt, [URL]),
+	    Desc = str:translate_and_format(Lang, ?T("To register, visit ~s"), [URL]),
 	    xmpp:make_iq_result(
 	      IQ, #register{instructions = Desc,
 			    sub_els = [#oob_x{url = URL}]});
diff --git a/src/mod_roster.erl b/src/mod_roster.erl
index f41c5bf1a..438e6d3e0 100644
--- a/src/mod_roster.erl
+++ b/src/mod_roster.erl
@@ -1053,7 +1053,7 @@ user_roster(User, Server, Query, Lang) ->
 					end,
 					SItems)))])]
 	     end,
-    PageTitle = str:format(translate:translate(Lang, ?T("Roster of ~ts")), [us_to_list(US)]),
+    PageTitle = str:translate_and_format(Lang, ?T("Roster of ~ts"), [us_to_list(US)]),
     (?H1GL(PageTitle, <<"modules/#mod-roster">>, <<"mod_roster">>))
       ++
       case Res of
diff --git a/src/str.erl b/src/str.erl
index 16e167664..c3206a261 100644
--- a/src/str.erl
+++ b/src/str.erl
@@ -64,10 +64,11 @@
          to_float/1,
          prefix/2,
          suffix/2,
-	 format/2,
+         format/2,
          to_integer/1,
          sha/1,
-         to_hexlist/1]).
+         to_hexlist/1,
+         translate_and_format/3]).
 
 %%%===================================================================
 %%% API
@@ -288,6 +289,11 @@ suffix(B1, B2) ->
 format(Format, Args) ->
     unicode:characters_to_binary(io_lib:format(Format, Args)).
 
+-spec translate_and_format(binary(), binary(), list()) -> binary().
+
+translate_and_format(Lang, Format, Args) ->
+    format(unicode:characters_to_list(translate:translate(Lang, Format)), Args).
+
 
 -spec sha(iodata()) -> binary().