Improve code in get_context_data in GlossDetailView

[susanodd]

As part of Public View in #1419 #1403, a template has been created dictionary/gloss.html and well as a new python file for the context variables that are shared and used in both views, context_data_gloss.py

The phonology code that is originally used and some of the code only used by the original template dictionary/gloss_detail.html has not yet been cleaned up.

Improve the Phonology "loop" and separate the choice lists (used in Edit functionality) out of the loop so the shared functionality can be moved to the Python file context_data_gloss.py and shared.

Do the remaining code cleanup here.