There are 15 files for the corresponding 15 European languages:
Albanian, Bosnian, Bulgarian, Croatian, English, German, Hungarian,
Polish, Portuguese, Russian, Serbian, Slovak, Slovenian, Spanish, and Swedish.

Files are in the standard csv format, each line has the following form:
TweetID,HandLabel,AnnotatorID

TweetID is assigned by Twitter and can be used to retreive the tweet.
HandLabel is the sentimen label as assigned by the human annotator
(Negative, Neutral, or Positive).
AnnotatorID is a 3-digit integer assigned to anonymous annotators,
and can be used to identify tweets annotated several times by the
same or by different annotators.