You can use biopython/bioperl to retrieve the translation frame of your blast result. Then use that frame to do a translation of your query nucleotide sequence.

Here is how to parse the blast output: http://biopython.org/DIST/docs/tutorial/Tutorial.html#htoc90

Here is how to do a translation of your nucleotide sequence: http://biopython.org/DIST/docs/tutorial/Tutorial.html#htoc25