YOU SAID:
This is so much fun. I remember "Babelizer" which does the same thing, but better... except worse. It seems to have more options, but it is not web-based and I have never gotten it to work :-(.
INTO JAPANESE
{"translatedText":"\u3053\u308c\u306f\u3068\u3066\u3082\u697d\u3057\u3044\u3067\u3059\u3002\u79c1\u306f\u540c\u3058\u3053\u3068\u3092\u3057\u307e\u3059\u304c\u3001\u60aa\u3044\u3053\u3068\u3092\u9664\u3044\u3066...\u3088\u308a\u826f\u3044 \"Babelizer\u300d\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u3002\u3088\u308a\u591a\u304f\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6301\u3063\u3066\u3044\u308b\u3088\u3046\u3060\u304c\u3001\u305d\u308c\u306f\u3001Web\u30d9\u30fc\u30b9\u3067\u306f\u306a\u3044\u3068\u79c1\u306f:-(\u3092\u52d5\u4f5c\u3059\u308b\u3088\u3046\u306b\u305d\u308c\u3092\u5f97\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u305b\u3093\u3002"}
BACK INTO ENGLISH
{"translatedText":"{\"translatedText\":\"\\u3053\\u308c\\u306f\\u3068\\u3066\\u3082\\u697d\\u3057\\u3044\\u3067\\u3059\\u3002\\u79c1\\u306f\\u540c\\u3058\\u3053\\u3068\\u3092\\u3057\\u307e\\u3059\\u304c\\u3001\\u60aa\\u3044\\u3053\\u3068\\u3092\\u9664\\u3044\\u3066...\\ u3088 \\u308a\\u826f\\u3044 \/ \"Babelizer \\u300d\\u3092\\u899a\\u3048\\u3066\\u3044\\u307e\\u3059\\u3002\\u3088\\u308a\\u591a\\u304f\\u306e\\u30aa\\u30d7\\u30"}
INTO JAPANESE
{"translatedText":"{\"translatedText\":\"{\\\"translatedText\\\":\\\"\\\\u3053\\\\u308c\\\\u306f\\\\u3068\\\\u3066\\\\u3082\\\\u697d\\\\u3057\\\\u3044\\\\u3067\\\\u3059\\\\u3002\\\\u79c1\\\\u306f\\\\u540c\\\\u3058\\\\u3053\\\\u3068\\\\u3092\\\\u3057\\\\u307e\\\\u3059\\\\u304c\\\\u3001\\\\u60aa\\\\u3044\\\\u3053\\\\u3068\\\\u3092\\\\u9664\\\\u3044\\\\u3066...\\\\ u3088 \\\\u308a\\\\u826f\\\\u3044 \\\/ \\\"Babelizer \\\\u300d\\\\u3092\\\\u899a\\\\u3048\\\\u3066\\"}
BACK INTO ENGLISH
{"translatedText":"{\"translatedText\":\"{\\\" translatedText \\ \": \\\" {\\ \"\\ translatedText\": \\ \"\\\\\\\\3053\\\\\\\\308c\\\\\\\\306f\\\\\\\\3068\\\\\\\\3066\\\\\\\\3082\\\\\\\\697d\\\\\\\\3057\\\\\\\\3044\\\\\\\\3067\\\\\\\\3059\\\\\\\\3002\\\\\\\\79c1\\\\\\\\306f\\\\\\\\540c\\\\\\\\3058\\\\\\\\ u3053 \\\\\\\\u3068\\\\\\\\u3092\\\\\\\\u3057\\\\\\\\u307e\\\\\\\\u3059\\\\\\\\u304c\\\\\\\\u3001\\\\\\\\u60aa\\\\\\\\u3044\\\\\\\\u3053\\\\\\\\u3068\\\\\\\\u3092\\\\\\\\u9664\\\\\\\\u3044\\\\"}
INTO JAPANESE
{"translatedText":"{\"translatedText\":\"{\\\"translatedText\\\":\\\"{\u304b\u304e\"translatedText \\\\ \\\": \u304b\u304e\"{\\\\ \\\u300c\\\\ translatedText\\\u300d: \\\\ \\\"\\\\\\3053\\\\\\308c\\\\\\306f\\\\\\3068\\\\\\3066\\\\\\3082\\\\\\697d\\\\\\3057\\\\\\3044\\\\\\3067\\\\\\3059\\\\\\3002\\\\\\79c1\\\\\\306f\\\\\\540c\\\\\\3058\\\\\\ u3053 \\\\\\u3068\\\\\\u3092\\\\\\u30"}
BACK INTO ENGLISH
{"translatedText":"{\"translatedText\":\"{\\\" translatedText \\ \": \\\" {\\ \"\\ translatedText\": \\ \"{\\u304b\\u304e\\\"translatedText \\\\\\\\ \\\": \\u304b\\u304e\\\" {\\\\\\\\ \\\\\\u300c\\\\\\\\ translatedText \\\\\\u300d: \\\\\\\\ \\ \"\\\\\\\\\\\\3053\\\\\\\\\\\\308c\\\\\\\\\\\\306f\\\\\\\\\\\\3068\\\\\\\\\\\\ 3066 \\\\\\\\\\\\3082\\\\\\\\\\\\697d\\\\\\\\\\\\3057\\\\\\\\\\\\3044\\\\\\\\\\\\3067\\\\\\\\\\\\3059\\\\\\\\\\\\3002\\\\\\\\\\\\79c1\\\\\\\\\\\\306f\\\\\\\\\\\\540c\\\\\\\\\\\\3058\\\\\\\\\\\\ u3053 \\"}
INTO JAPANESE
{"translatedText":"{\"translatedText\":\"{\\\"translatedText\\\":\\\"{\u304b\u304e\"translatedText \\\\ \\\": \u304b\u304e\"{\\\\ \\\u300c\\\\ translatedText\\\u300d: \\\\ \\\"{\\\\u304b\\\\u304e\\\\\\\"translatedText \\\\\\ \u304b\u304e\u300d: \\\\u304b\\\\u304e\\\\\\\"{\\\\\\ \\\\\\u300c\\\\\\ translatedText \\\\\\u300d: \\\\\\ \\\\ \\\"\\\\\\3053\\\\\\308c\\\\\\306f\\\\\\3068\\\\\\ 3066 \\\\\\3082\\\\\\"}
BACK INTO ENGLISH
{"translatedText":"{\"translatedText\":\"{\\\" translatedText \\ \": \\\" {\\ \"\\ translatedText\": \\ \"{\\u304b\\u304e\\\"translatedText \\\\\\\\ \\\": \\u304b\\u304e\\\" {\\\\\\\\ \\\\\\u300c\\\\\\\\ translatedText \\\\\\u300d: \\\\\\\\ \\ \"{\\\\\\\\u304b\\\\\\\\u304e\\\\\\\\\\\\\\\" translatedText \\\\\\\\\\\\ \\ 304b \\304e\\300d: \\\\\\\\304b\\\\\\\\304e\\\\\\\\\\\\\\ \"{\\\\\\\\\\\\ \\\\\\\\\\\\300c\\\\\\\\\\\\ translatedText \\\\\\\\\\\\300d: \\\\\\\\\\\\ \\\\\\\\ \\\" \\\\\\\\\\\\305"}
INTO JAPANESE
{"translatedText":"{\"translatedText\":\"{\\\"translatedText\\\":\\\"{\u304b\u304e\"translatedText \\\\ \\\": \u304b\u304e\"{\\\\ \\\u300c\\\\ translatedText\\\u300d: \\\\ \\\"{\\\\u304b\\\\u304e\\\\\\\"translatedText \\\\\\ \u304b\u304e\u300d: \\\\u304b\\\\u304e\\\\\\\"{\\\\\\ \\\\\\u300c\\\\\\ translatedText \\\\\\u300d: \\\\\\ \\\\ \\\"{\\\\\\u304b\\\\\\u304e\\\\\\\"translatedText \\\\\\ \\\\ 304b \\\\304e\\\\300d: \\\\\\30"}
BACK INTO ENGLISH
{"translatedText":"{\"translatedText\":\"{\\\" translatedText \\ \": \\\" {\\ \"\\ translatedText\": \\ \"{\\u304b\\u304e\\\"translatedText \\\\\\\\ \\\": \\u304b\\u304e\\\" {\\\\\\\\ \\\\\\u300c\\\\\\\\ translatedText \\\\\\u300d: \\\\\\\\ \\ \"{\\\\\\\\u304b\\\\\\\\u304e\\\\\\\\\\\\\\\" translatedText \\\\\\\\\\\\ \\ u304b \\u304e\\u300d: \\\\\\\\u304b\\\\\\\\u304e\\\\\\\\\\\\\\ \"{\\\\\\\\\\\\ \\\\\\\\\\\\u300c\\\\\\\\\\\\ translatedText \\\\\\\\\\\\u300d: \\\\\\\\\\\\ \\\\\\\\ \\\" {\\\\\\\\\\\\u3"}
INTO JAPANESE
{"translatedText":"{\"translatedText\":\"{\\\"translatedText\\\":\\\"{\u304b\u304e\"translatedText \\\\ \\\": \u304b\u304e\"{\\\\ \\\u300c\\\\ translatedText\\\u300d: \\\\ \\\"{\\\\u304b\\\\u304e\\\\\\\"translatedText \\\\\\ \u304b\u304e\u300d: \\\\u304b\\\\u304e\\\\\\\"{\\\\\\ \\\\\\u300c\\\\\\ translatedText \\\\\\u300d: \\\\\\ \\\\ \\\"{\\\\\\u304b\\\\\\u304e\\\\\\\"translatedText \\\\\\ \\\\ u304b \\\\u304e\\\\u300d: \\\\\\"}
BACK INTO ENGLISH
{"translatedText":"{\"translatedText\":\"{\\\" translatedText \\ \": \\\" {\\ \"\\ translatedText\": \\ \"{\\u304b\\u304e\\\"translatedText \\\\\\\\ \\\": \\u304b\\u304e\\\" {\\\\\\\\ \\\\\\u300c\\\\\\\\ translatedText \\\\\\u300d: \\\\\\\\ \\ \"{\\\\\\\\u304b\\\\\\\\u304e\\\\\\\\\\\\\\\" translatedText \\\\\\\\\\\\ \\ u304b \\u304e\\u300d: \\\\\\\\u304b\\\\\\\\u304e\\\\\\\\\\\\\\ \"{\\\\\\\\\\\\ \\\\\\\\\\\\u300c\\\\\\\\\\\\ translatedText \\\\\\\\\\\\u300d: \\\\\\\\\\\\ \\\\\\\\ \\\" {\\\\\\\\\\\\u3"}
Well done, yes, well done!