Remove verbose_name from hidden fields

verbose_name is unnecessary for hidden field.
Some verbose_name does not have much meaning
(it is just a mirror of form field name), but
it is marked as translated and such strings
are difficult to translate. To address this,
this commit cleans up verbose_name of hidden fields.

Change-Id: I14fc242f90ce22abe5a0517b44968c2a98f97f48
Closes-Bug: #1291548
Host aggregates missing the metadata column

When the Host Aggregates table was moved to its own panel, we lost the
'metadata' column. Bringing it back. It contains useful information and should
be displayed in the table.

Change-Id: Ic87c31904ead459cbee2283268f8b30ce7d47acf
Closes-Bug: 1289466
Remove I18N strings from test/settings.py

There is no need to mark strings in test/settings.py translatable.

Change-Id: I7ee8363ceb018a75fd6f785ed2fcef209068d883
Merge "Host aggregates missing the metadata column"
Merge "Remove verbose_name from hidden fields"
Merge "Remove I18N strings from test/settings.py"