organise requirements files

alphabetise requirements so it's easier to see what packages we
depend on.

Change-Id: I27fc8d042c7d38267a4134215ccacc4a6b373e0b
Imported Translations from Transifex

Change-Id: I5813774fefd9863e8c26744ffc8aa280cc70dd03
Merge "organise requirements files"