Added Magento_TranslationGraphQl module to support PWA Studio Localization

[chris-brabender]

Description (*)

This pull request adds a GraphQL module for the Magento_Translation module. It creates two GraphQL queries to:

1. Retrieve translated phrases for a supplied locale
2. Retrieval of available locales configured within Magento

This feature is to support the Localization tasks in the PWA Studio Project - magento/pwa-studio#669

In the PWA Studio project, a Buildpack command extracts phrases from the PWA Project and requests translated phrases from the Magento backend. This effort is to allow PWA Studio to feature localisation and multiple store views. The Available Locales query is used by PWA Studio Buildpack to know what locales it should query for.

Related Pull Requests

PWA Studio work (pending finalisation and review) - https://github.com/magento/pwa-studio/compare/develop...chris-brabender:feature/prototype-v2?expand=1

Manual testing scenarios (*)

Using postman for example, you can provide a GraphQL payload similar to:

{ translate ( locale: "fr_CA" phrases: ["General", "Add to Cart", "Api Keys", "Behavior"] ) { items { original translated } } }

This assumes you have a French language pack installed.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

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[zetlen]

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[pmarjan]

@magento run all tests

[maghamed]

We pass store header right now for all requests, and based on this header we might resolver what language should be used for all translatable attributes. Translations might be part of PWA application and all the translations would be built-in while assembling of PWA app.

If we would introduce independent translation endpoint
We would need to resolve translations also independently
Not sure that we want it, at least now.

This PR was not created to Arch repo, so no one from our team had an ability to review it
Thus, I just wanted to make sure that if it would be processed we need broader discussion here.
As it might be quite a crucial point whether we want to decouple translation from store view, or keep as-is
@akaplya @paliarush @zetlen @kokoc

[nrkapoor]

We pass store header right now for all requests, and based on this header we might resolver what language should be used for all translatable attributes. Translations might be part of PWA application and all the translations would be built-in while assembling of PWA app.

If we would introduce independent translation endpoint
We would need to resolve translations also independently
Not sure that we want it, at least now.

This PR was not created to Arch repo, so no one from our team had an ability to review it
Thus, I just wanted to make sure that if it would be processed we need broader discussion here.
As it might be quite a crucial point whether we want to decouple translation from store view, or keep as-is
@akaplya @paliarush @zetlen @kokoc

@maghamed I will put the PR on hold so we can review the design.

[sivaschenko]

@davemacaulay @nrkapoor Hi guys, can you please suggest the priority/severity for this pull request to correctly facilitate the processing.

[davemacaulay]

@sivaschenko this is no longer needed as we implemented a different solution for i18n in PWA.

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