Bluemix/Node-RED demo from IBM Watson Tech Pioneer and Developer Day. Monitors tweets and routes through Watson Q&A API, with added translation

gistfile1.js

[
  {
    "id": "489498c.fb76b68",
    "type": "watson-question-answer",
    "name": "",
    "output": "top",
    "corpus": "healthcare",
    "x": 469,
    "y": 240,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "e3421933.1cbde8"
      ]
    ]
  },
  {
    "id": "ab125e42.54eda",
    "type": "watson-language-identification",
    "name": "",
    "x": 482,
    "y": 44,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "39a44321.c65bbc"
      ]
    ]
  },
  {
    "id": "40f5fe83.bf0a",
    "type": "twitter in",
    "twitter": "",
    "tags": "",
    "user": "true",
    "name": "",
    "topic": "tweets",
    "x": 84,
    "y": 44,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "f85a874a.07a578"
      ]
    ]
  },
  {
    "id": "f85a874a.07a578",
    "type": "function",
    "name": "Filter tweet data",
    "func": "// Ignore tweets from your demo account so we don't get stuck in a loop\nif (msg.user == \"<test twitter handle>\") return null;\n\n// Remove the username from the tweet.\nmsg.payload = msg.payload.replace(/\\@\\S+\\s*/i, \"\");\n\nreturn msg;",
    "outputs": 1,
    "x": 270,
    "y": 44,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "ab125e42.54eda"
      ]
    ]
  },
  {
    "id": "39a44321.c65bbc",
    "type": "function",
    "name": "Check Language",
    "func": "// Keep track of language for translating back later\nmsg.language = msg.lang\n\nif (msg.lang == \"en-US\") {\n\t// If the question was in english then return it on first output\n    return [msg,null];\n}\nelse {\n\t// otherwise turn it into a code for the machine\n\t// translation service to translate to english\n\t// Format: \"mt-<from code>-enus\"\n    msg.lang = \"mt-\" + msg.lang.toLowerCase().replace(/\\-/, \"\") + \"-enus\"\n    return [null, msg];\n}",
    "outputs": "2",
    "x": 148,
    "y": 186,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "489498c.fb76b68"
      ],
      [
        "986364da.679c98"
      ]
    ]
  },
  {
    "id": "986364da.679c98",
    "type": "watson-translate",
    "name": "",
    "language": "",
    "x": 171,
    "y": 290,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "489498c.fb76b68"
      ]
    ]
  },
  {
    "id": "42952348.bd6adc",
    "type": "function",
    "name": "Convert to a \"tweet\"",
    "func": "// Add username to the message and trim to 140chars\nmsg.payload = (\"@\" + msg.user + \" \" + msg.payload).substr(0, 140);\nreturn msg;",
    "outputs": 1,
    "x": 613,
    "y": 494,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "b7f2316c.480dd"
      ]
    ]
  },
  {
    "id": "b7f2316c.480dd",
    "type": "twitter out",
    "twitter": "",
    "name": "Tweet",
    "x": 786,
    "y": 494,
    "z": "17a16c06.e85e94",
    "wires": []
  },
  {
    "id": "e3421933.1cbde8",
    "type": "function",
    "name": "Translate back to original language",
    "func": "if (msg.lang == \"en-US\") {\n    return [msg,null];\n}\nelse {\n    msg.lang = \"mt-enus-\" + msg.language.toLowerCase().replace(/\\-/, \"\")\n    return [null, msg];\n}",
    "outputs": "2",
    "x": 198,
    "y": 502,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "42952348.bd6adc"
      ],
      [
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    ]
  },
  {
    "id": "9d4b21cc.62b4e",
    "type": "watson-translate",
    "name": "",
    "language": "",
    "x": 455,
    "y": 544,
    "z": "17a16c06.e85e94",
    "wires": [
      [
        "42952348.bd6adc"
      ]
    ]
  }
]

Somehow msg.user did not work for me on the 'Convert to a "tweet"'node. I modified the 'twitter in' node to monitor direct messages and used msg.tweet.sender.screen_name on the 'Convert to a "tweet"'node, and that worked. Great demo, even if the Watson translation to French could be improved upon. Thank you.