This is a preparatory commit for using isort for sorting all of our
imports, merging changes to files where we can easily review the
changes as something we're happy with.
These are also files with relatively little active development, which
means we don't expect much merge conflict risk from these changes.
The "Short/Long Text" option for custom profile fields wasn't properly
capitalized (i.e. "Text" should have been all lowercase), and also
wasn't properly tagged for translation.
For the sake of consistency, the change to proper capitalization has
also been applied to the models and any tests involving this feature.
Due to a bug in Django, it complained about the models having changed
and thus not being consistent with the migrations. That isn't actually
true (since the database stores the numeric values for each key), but
the migrations have been modified to avoid this error. This does not
affect the migrations' behaviour in any way.