WordCamps cannot be filtered by language

[Zodiac1978]

Components / Tools

[Component] Events Widget

Description

As a meetup organizer I try to tell our community/visitors what happens beside our meetup. In our intro I show them all WordCamps which will happen in the next time.

For WordCamps in my home country this is easy, as the language will be no problem.

But for international WordCamps I always need to check the WordCamps websites if this is a WordCamp that have at least an English track.

On the Events page, there is no way to check this in general:
​https://events.wordpress.org/
I can filter by Country, but not by language used.

I need to visit every page and check it manually.

The dashboard widget in the WP backend is also somewhat limited. It shows me Meetups and WordCamps based on my city location. This is a great way to show the nearest Meetups, but it doesn't make much sense for WordCamps. For this bigger events I would travel to e.g. Vienna (upcoming WordCamp in my language, as it is bilingual German/English), but this is not shown for my northern Germany town Hamburg.

I would like to see a way to set up the language used at a WordCamp, enabling filtering for language on the events page and in the dashboard widget.

Screenshots / Screencasts

n/a

Stakeholders

Everyone interested in traveling to international WordCamps, Event organizer

How does this new feature contribute to the goals

Filtering the language used at a WordCamp would make it much easier to filter WordCamps (for the dashboard widget or on the events page). No manual searching on the website if international folks are welcome (if they don't speak the local language).

As a speaker I can filter at which WordCamp I could try to pitch my (English) talk,
as a visitor I can filter which WordCamp offers e.g. an English track (even if the WordCamp is in Spain and I don't speak Spanish),
as a sponsor I can filter which WordCamp will have a more international group of people (or the opposite) which could be relevant for my marketing goals (thinking about target groups)

I would say, everyone profits if the WordCamp has a clear sign which languages are offered. If this sign is machine readable and filterable, this would make our other tools better. The WordCamp Vienna (English/German) could be shown to a broader set of people, but a German only Wordcamp (like Leipzig) would be only shown in German dashboards.

Acceptance Criteria

I think this needs more steps:

1. WordCamps need a way to set up their languages. As WordPress does not offer multilingual setups, we cannot use the language from the WordCamp site alone.
2. The Events API needs to accept a new parameter "language" for filtering the output.
3. The events page needs a new dropdown for language filtering.
4. The dashboard widget needs to send the language (per default?) for filtering the output of the events API.

Priority

There is no rush needed. It is an enhancement to optimize the UX, but it is only about making this easier and faster.