Missing labels / accessible names for input and select elements

[aviannamiller]

A few missing labels / names on item edit:

• Text input item_relations_item_relation_object_item_id is missing a label.
• select element item_relations_property_id is missing an accessible name.

[aviannamiller]

On Map -> Browse:

• item_relations_property_id select is missing an accessible name.
• item_relations_clause_part radio inputs are missing labels.

[aviannamiller]

Edit Custom Vocabulary:

• All textarea and checkbox inputs are missing labels.

[aviannamiller]

On Items -> Search:

• object and subject radio inputs are missing labels.
• item_relations_property_id select is missing a name.