Lexeme Details: Sense: Base Category

[dwhieb]

Add the base category field (called "Base Category") to the sense in the Lexeme Details page.

For now, the only information needed by this field is the category it attaches to.

• [x] design UI
• [x] test data (row 66)
• [x] HTML (with fallback for no data)
• [x] CSS
• [x] integration test