builtin function: fix a misleading error message

Issue introduced in 7914c92824 (replaced the functions '--rename'
option with '--copy'., 2010-09-09).

po/de.po

@@ -381,9 +381,10 @@ msgstr "%ls: Erwartete exakt zwei Namen (momentanen Funktionsnamen und den Neuen
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr "%ls: Erwartete generic | variable | signal | exit | job-id für --handlers-type\n"
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
-msgstr "%ls: Funktion '%ls' existiert schon. Konnte Kopie '%ls' nicht anlegen\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
+msgstr ""
 
 #, c-format
 msgid "%ls: Function '%ls' does not exist\n"

po/en.po

@@ -379,9 +379,10 @@ msgstr "%ls: Expected exactly two names (current function name, and new function
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr ""
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
-msgstr "%ls: Function “%ls” already exists. Cannot create copy “%ls”\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
+msgstr ""
 
 #, c-format
 msgid "%ls: Function '%ls' does not exist\n"

po/fr.po

@@ -480,9 +480,10 @@ msgstr "%ls : Exactement deux noms attendus (noms de fonctions actuel et projet
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr ""
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
-msgstr "%ls : La fonction '%ls' existe déjà. Impossible de créer la copie '%ls'\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
+msgstr ""
 
 #, c-format
 msgid "%ls: Function '%ls' does not exist\n"

po/pl.po

@@ -375,9 +375,10 @@ msgstr "%ls: Oczekiwano dokładnie dwóch nazw (nazwa obecnej funkcji i nazwa no
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr ""
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
-msgstr "%ls: Funkcja '%ls' już istnieje. Nie można utworzyć kopii '%ls'\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
+msgstr ""
 
 #, c-format
 msgid "%ls: Function '%ls' does not exist\n"

po/pt_BR.po

@@ -380,9 +380,10 @@ msgstr "%ls: Esperava exatamente dois nomes (nome atual da função, e novo nome
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr ""
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
-msgstr "%ls: Função “%ls” já existe. Não é possivel criar cópia “%ls”\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
+msgstr ""
 
 #, c-format
 msgid "%ls: Function '%ls' does not exist\n"

po/sv.po

@@ -376,8 +376,9 @@ msgstr ""
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr ""
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
 msgstr ""
 
 #, c-format

po/zh_CN.po

@@ -373,9 +373,10 @@ msgstr "%ls: 预期有两个确切的名称(当前函数名称, 和新函数名
 msgid "%ls: Expected generic | variable | signal | exit | job-id for --handlers-type\n"
 msgstr "%ls: 对于 --handlers-type 选项，预期 generic | variable | signal | exit | job-id \n"
 
+#
 #, c-format
-msgid "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n"
-msgstr "%ls: 函数 '%ls' 已经存在 . 无法创建复制 '%ls'\n"
+msgid "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n"
+msgstr ""
 
 #, c-format
 msgid "%ls: Function '%ls' does not exist\n"

src/builtins/functions.rs

@@ -351,7 +351,7 @@ pub fn functions(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr]) -
 
         if function::exists(new_func, parser) {
             streams.err.append(wgettext_fmt!(
-                "%ls: Function '%ls' already exists. Cannot create copy '%ls'\n",
+                "%ls: Function '%ls' already exists. Cannot create copy of '%ls'\n",
                 cmd,
                 new_func,
                 current_func