Trauma - The song is about passing by bad situations and getting stronger... surviving to traumas
alterna - in both portuguese and spanish, means "alterno adj. alternating; alternate" in the feminine form... So, this means she is saying she is a "alternating person" maybe
will - will can means "wish"
FRIEND II - she explain why "friend 2" on asfxx interviews
Replace - She is leaving and replacing her with a song^^
Forgiveness - well... it's a song about forgiveness xD first "Sometimes/ We make/ Terrible mistakes" and then "Maybe everyone did so to protect love"
HANABI - hanabi means "fireworks", in Japan fireworks are very common in the end of summer^^ And the song as she said once, is meant to have a "end of summer sad feeling" (there may be something more specific about the use of the fireworks, but I don't know very much is aspect of japanese people)
heartplace - It's a song about searching for your heartplace, if I'm not wrong
free & easy - I think here again she is singing about wanting something, this time, about being free & easy "Sometimes I ask myself, how much farther will I have to go?"
=)
Never got the boys & girls thing either...