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coinos Internationalization - Technical Information

NOTE: This documentation was written for people with a technical background. If you do not have a technical background, consider reading this guide instead.

Last Updated: 2022-08-23

Dependencies

coinos's internationalization system depends on the npm package sveltekit-i18n. Consider reading its documentation in addition to this.

Internationalization Code

The main code for coinos's internationalization is at src/lib/translations/index.js. When imported, it does the following:

  1. Load all of the locales asynchronously, based on .
  2. Initialize sveltekit-i18n.

It also defines important constants, including the list of available locales and the default locale. This code is loaded by importing $lib/translations in src/routes/+layout.svelte. This code, which runs in the frontend, also persists the locale in localStorage.

Locale Files

Each locale in coinos-ui-v2 is defined by a JSON file in src/locales. Its name is the locale's ISO 639-1 code plus .json. It is simply a file that maps string IDs to translated strings. Here is an example of en.json:

{
	"howItWorks": "How it works",
	"faq": "FAQ",
	"about": "About",
	"startInSeconds": "Start in Seconds",
	"signIn": "Sign In"
}

Internationalizing Strings

Strings are internationalized by simply using sveltekit-i18n's $t function. A localized string looks like this:

{$t('stringID')}

The Locale Selector

coinos also has a LocaleSelector component, which should be used to select locales. It is a dropdown that allows you to select & update the locale.

The Guided Translation Script

coinos has a Python script that helps you with the technical parts of translation. It is located at src/locales/guided_translation.py. It also has some utility functions:

  • nested_dict_keys - gets a list of keys of a nested dictionary in dot-separated shallow format (e.g. a.b.c)
  • create_locale - adds a new locale to the lang.json file
  • localize_string - localizes a string interactively