* Move English help about e-mail node to en-US directory
* Move English help about rbe node to en-US directory
* Move English help about tail node to en-US directory
* Move English help about twitter node to en-US directory
* Move English help about feedparse node to en-US directory
* Move English help about sentiment node to en-US directory
* add Japanese info text of twitter node
* add Japanese info text of feedparse node
* add Japanese info text of email node
* add Japanese info text of rbe node
* minor fix of Japanese info text of email node
* minor fix of Japanese info text of email node