display english and spanish event media links correctly

[hancush]

this pr:

• pins la-metro to the latest version of django councilmatic to take advantage of multiple related EventMedia
• updates template logic here and here to iterate over and display event.media_urls rather than only one event.media_url
• refactors extra_context here to grab both english and spanish live media links (and make logic more obvious: a link to live media appears in legistar when a meeting is ongoing)
• update all listen link text to "watch in english" and "ver en español"

addresses #263

[hancush]

to generate both live media links for bilingual events, we need the guids of both the english and spanish events. to do that, we'll add the spanish event as an additional source to the unified event in the upstream scraper.

[hancush]

blurgh, we don't import all of the sources into councilmatic, so an additional source would require changes there, too.

[hancush]

we also only add the web detail link if it exists, otherwise we just add a link to the calendar. these links don't seem to exist, until after the meeting has passed.

[fgregg]

How would we get the GUID if the meeting detail url didn't exist? Is that knowable some other way?

[hancush]

@fgregg it's on the api event; we save it in the extras, and import it in django-councilmatic.

we could save the spanish guid in the extras, as well, but we'd still need to make a change in django-councilmatic to facilitate > 1 event guid.

[fgregg]

@fgregg it's on the api event; we save it in the extras, and import it in django-councilmatic.

we could save the spanish guid in the extras, as well, but we'd still need to make a change in django-councilmatic to facilitate > 1 event guid.

This seems sensible to me.

It also seems to me that we should add the spanish api event url and, when available, the spanish legistar meeting url to the OCD data when available, even if we don't import that data into councilmatic.

[fgregg]

looks pretty good. I think one of your methods is doing too much, but otherwise looks good.

[fgregg]

For me this would be clearer if you _valid_or_gener was just _valid, and then you handled the fallback case here.

[hancush]

Great point, updated in eb57335