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flyPadOS 3 Localization Process

This page is pulled externally from the A32NX repository and describes the processes involved with adding features to the EFB and sourcing translations.


Development Process

  • To add something to the EFB simply add the key and English phrase to the en.json file.
    • src/systems/instruments/src/EFB/Localization/en.json
  • Ping in the Discord channel #efb to have someone with write permission to Localazy to add the key (several ways to do that - but the permission required is powerful). Adding it is a 2min thing.
  • Do this in good time before it is merged to master
  • Translators can now start to translate this (worst case is the term is not translated and shown in English)
  • Same for removing or changing keys - do the change locally in the English source file and ping in #efb


The update could be automated via GitHub actions (as the download is - it's basically one command) but this would require the write key to be part of env and is very risky. If a dev removes required keys or even removes everything from the en.json then this change will immediately be sent to Localazy by everybody who can trigger the GitHub action.

Of course, we can include measures to only do this for merges to master etc. but at some point the upload will have to happen and then potentially overwrite stuff at Localazy which might impact others.

As Localazy does not do versioning and also does not allow to undo these uploads this process is risky. Any issues will need to be fixed by uploading a previous version of the source file (or a specific language file) which is why I like them to be versioned and persisted in GitHub. We can at any time even role back changes to translation this way.

Build Process


Downloading of the latest approved translations happens at every build on GitHub. It is part of the build pipeline but only runs in the GitHub Action context to not update local files for Developers.

✓ a32nx
  ✓ preparation
    ✓ efb-translation
  ✓ build
    ✓ instruments


To update the language files locallyhe languaes you need to run:

npm run build:efb-translation local

This downloads the latest translations directly from Localazy to the 'downloaded' folder (src/systems/instruments/src/EFB/Localization/downloaded).

It checks the JSON syntax and writes new JSON files for each language to the src/systems/instruments/src/EFB/Localization folder from there they can be imported in the src/systems/instruments/src/EFB/translation.ts.

Update Source File

This can only be done by Owners/Managers of the Localazy project - ask in the Discord #efb channel for support

Although an automatic update could be done we have chosen to manually make changes to the keys (new keys, removal of keys).

This can either be done by the UI of Localazy - adding and removing single keys - or by changing the en.json file and then upload this to Localazy.

Using Localazy Website

  • Go to File Management and click on flybywireos3.json
  • Add, change and remove keys manually in the UI

Using en.json and Localazy Website

  • Make the necessary changes to the en.json (adding keys, removing key, changing default English strings)
  • Go to File Management and click on flybywireos3.json
  • Click the three-dots menu on the right of the flybywireos3.json file and select "Update file content"
  • Drag and Drop the en.json to the dialog which came up
  • It should recognize it as English
  • Click "Next Step"
  • Check "Mark strings excluded from this batch as deprecated" to remove keys
  • Uncheck all the other checkboxes
  • Review the changes in the source file - removed keys should shows a red and deprecated, new keys should be available
  • These changes now apply to all languages
    • removed keys are deprecated and not visible to translators any more and should also not be included in any downloads
    • new keys are ready to be translated in all other languages

Using the en.json


  • Make a copy of the en.json named flybywireos3.json
  • Use the command: localazy upload -s -k keys.json
    • You need to have the Localazy read and write keys in the keys.json file.
  • The option -s is a test mode not changing anything. Remove this option to actually upload the file.
  • The configuration from the file localazy.json upload section will be used.

Last update: March 9, 2023