Prepare align by adding `label` to table and crawl entities based on `ontology class`.

I added labels in order to align graphs easier.
`tvtropes` uses name as plain text in English, so I decided to use English label.

In addition, I started to crawl entities which are belong to `ontology class`, such as `Artist`, `Film` ... and so on.
I think it's better to change like this.

```python
except (HTTPError, URLError, ConnectionResetError, IncompleteRead, EndPointNotFound) as e:
    logger.exception('%s: %s, tried %d/%d', e.__class__.__name__, e, tried)
```