Update runtime/lang/Makefile

Import the latest changes from vim/vim.

runtime/lang/Makefile

@@ -1,22 +1,24 @@
 MASTER_MENU = menu_ja_jp.utf-8.vim
 
+SED = LANG=C sed
+
 test: update
 
 update: menu_ja_jp.euc-jp.vim menu_japanese_japan.932.vim
 
 menu_ja_jp.euc-jp.vim: $(MASTER_MENU)
-	iconv -f utf-8 -t euc-jp $< | \
-	  sed -e 's/^scriptencoding utf-8/scriptencoding euc-jp/' \
-		-e 's/" Original translations/" Generated from $<, DO NOT EDIT/' \
-		-e 's/Menu Translations:\tJapanese (UTF-8)/Menu Translations:\tJapanese (EUC-JP)/' \
-		> $@
+	iconv -f UTF-8 -t EUC-JP $< | \
+		$(SED) -e 's/scriptencoding utf-8/scriptencoding euc-jp/' \
+			-e 's/" Original translations/" Generated from $<, DO NOT EDIT/' \
+			-e 's/\(" Menu Translations:.*\)(.*)/\1(EUC-JP)/' \
+			> $@
 
 menu_japanese_japan.932.vim: $(MASTER_MENU)
-	iconv -f utf-8 -t cp932 $< | \
-	  sed -e 's/^scriptencoding utf-8/scriptencoding cp932/' \
-		-e 's/" Original translations/" Generated from $<, DO NOT EDIT/' \
-		-e 's/Menu Translations:\tJapanese (UTF-8)/Menu Translations:\tJapanese (CP932)/' \
-		> $@
+	iconv -f UTF-8 -t CP932 $< | \
+		$(SED) -e 's/scriptencoding utf-8/scriptencoding cp932/' \
+			-e 's/" Original translations/" Generated from $<, DO NOT EDIT/' \
+			-e 's/\(" Menu Translations:.*\)(.*)/\1(CP932)/' \
+			> $@
 
 force: touch
 	@$(MAKE) update