#2353 Brief_identification refactor

- refactor sub identify in Role/Sequence.pm to get Brief_identification for CDS, transcript

For testing:
Pages with Brief_identification:
Transcript: species/c_elegans/transcript/ZK897.2#045–10
CDS: species/c_elegans/cds/B0280.1a

Pages without Brief_identification:
CDS: species/c_elegans/cds/C55C2.5a#04–10
I will find such a transcript page later (I forgot which one I tested on)

Sequence: inherits the Role, but it has Tag Title instead of Brief_identification, so I didn’t touch it. For example, species/c_elegans/sequence/B0272 should display fine.