Render world locations

[jkempster34]

https://trello.com/c/ii6IgWnk

This is part of the work to move rendering away from Whitehall

Differences for the user compared to Whitehall

1. The total number of results is now displayed at the top of the page to match the /government/organisations page.
2. The "No world locations match that filter." message is removed because of the above.
3. Search behaviour now matches the /government/organisations page. Previously a multi-word search such as "uk p" would match all locations that contained those letters in individual words, now they must be in order.
4. The big number remains big when the viewport is mobile-sized. This is also the same as the /government/organisations page

Screenshots

PRODUCTION	THIS PR

Commits

Add locales for world locations

This adds the necessary locales to render the /world page.

Add world location index to the README

The README contains a list of live examples. Now that the world index page is
soon to be rendered by Collections, we can add it in.

Rename organisation list filter module

We are going to make this module more generic, this renames it so that we can
see the changes more easily when it's modified.

Make organisation list filtering JavaScript more generic

Before this JavaScript was moved from Whitehall to Collections, it was shared
between the /world page and the /government/organisations page. However,
since being moved it has been made specific to the /government/organisations
page.

Now that we are also moving the /world page to Collections, we want to make
this module more generic so that it can be shared again.

This also removes data-filter-list as it is unused.

Render a basic world index page

Render a basic page for /world including the title and additional links.

Render world locations on the world index page

The world index page displays a list of world locations sorted by letter. These
are already sorted alphabetically in the content item, so we only need to group
them.

Render international delegations on the world index page

The world index page displays a list of international delegations. These
are already sorted alphabetically in the content item.

Add JavaScript filter to world index

The world index page contains a JavaScript based search. We want to use the
list-filter module for this.

As the world locations on the page are grouped into letters, we need to add the
concept of an inner-block that can be hidden when no results are present.

Searches checked

/government/organisations

1. a ✅
2. ab ✅
3. Prime Minister's Office, 10 Downing Street ✅
4. number 10 ✅
5. ago ✅

/world

1. a ✅
2. a ✅
3. ab ✅
4. bonaire-st-eustatius-saba ✅
5. Bonaire/St Eustatius/Saba ✅
6. uk p ❌

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[brucebolt]

Looks good to me (from a backend perspective). Just a small question on whether we can remove the JSON fixture file.

I'd suggest getting a frontend dev in the owning team to look at the JavaScript and CSS too.

[hannako]

Thanks for taking the time to give such a great PR description. I've made a few comments on the Ruby code.

[jkempster34]

Thanks for taking the time to give such a great PR description. I've made a few comments on the Ruby code.

Thanks for the thorough review 🙌 I've addressed most points, but left a few questions as well

[hannako]

Looks great to me! I know @hannalaakso was wanting to review the javascript

[patrickpatrickpatrick]

Javascript looks good to me, very nice consolidation of the search terms in the presenter meaning we can generalise the filter script.