Also, makes small updates to `next_plan_forms_support.html`.
Removes unneeded "btn" and "btn-default" classes, and updates
the placeholder text for the input as not marked for translation.
View functions in `analytics/views/support.py` are moved to
`corporate/views/support.py`.
Shared activity functions in `analytics/views/activity_common.py`
are moved to `corporate/lib/activity.py`, which was also renamed
from `corporate/lib/analytics.py`.
Adds a helper since there are only a few different parameters for
all BillingSession child clases, `build_support_url`.
Also, renames `get_support_url` to more explicitly note that it
is for realms: `get_realm_support_url`.
This commit performs a minor update in 'from_name' text for
'support' and 'sponsorship' emails.
Removes capitalization and adds a comment specifying that the
emails are not user-facing.
Lauryn Menard
Prakhar Pratyush
Eeshan Garg