Amino Acid Sequence Dropped during DNASequence Dump

[melt6457]

Describe the bug
The amino acid sequence information is lost when DNASequences are dumped to python dicts.

To Reproduce
Create a DNASequence object with a translation that contains amino acid information. Use the dump function on that sequence. See the code snippet below.

ex_seq = models.DNASequence(bases='atgcataa', 
                            translations=[{'start'=0,  
                                           'end'=8, 'strand'=1, 
                                           'aminoAcids': 'MHK'}])

print(ex_seq.translations)
print(ex_seq.dump())

From this you will see different output for the translationSchema.

Expected behavior
The amino acid sequence information follows the translation dict during the data dump. In this example, for the translationSchema's of the two print statements to match up.

Additional context
One hacky fix is you can restore the amino acid sequence by saving a temporary translation and replacing the translation in the dump.