Fix picturehouse sub/dub attributes

[davidferguson]

• Add the subtitle language for showings, when it can be worked out.
• When a film is dubbed, add the dubbed language to the language attribute, if it can be worked out
• Add a kids attribute for the Kids Club (where adults must be accompanying a child)

[andrewferguson]

Firstly, we need to figure out how granular we want to be with children-only showings (Picturehouse has Watch with Baby, Toddler Time, and Kids showings).

Secondly, there are a number of missing attributes:

• Silver Screen (over 60s)
• Autism Friendly
• Dementia Friendly
• Q&As - note the URL slug of "big scream baby cinema". This attribute will require removing strings like "DIRECTOR Q&A" from the film title as well.

There is also Screen Arts which is the category for some live theatre events, along with NT Live and RSC. (The latter two may have been superseded by "Screen Arts").

Adding all these attributes in would seem like a sensible idea.

Another issue is that some non-cinema events are being saved. The one I noticed is The Big Ritzy Quiz. I'm not sure what the best way of handling this is, if it is even possible.

[andrewferguson]

This needs to be updated. Picturehouse has both a Watch with Baby and a Toddler Time category (in addition to the Kids' Club).