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About

Documenso uses the following stack to handle translations:
  • Lingui - React i10n library
  • Crowdin - Handles syncing translations
  • OpenAI - Provides AI translations
Additional reading can be found in the Lingui documentation.

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Requirements

You must insert setupI18nSSR() when creating any of the following files:
  • Server layout.tsx
  • Server page.tsx
  • Server loading.tsx
Server meaning it does not have 'use client' in it. 
import { setupI18nSSR } from '@documenso/lib/client-only/providers/i18n.server';

export default function SomePage() {
  setupI18nSSR(); // Required if there are translations within the page, or nested in components.

  // Rest of code...
}
Additional information can be found here.

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Quick guide

If you require more in-depth information, please see the Lingui documentation.

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HTML

Wrap all text to translate in <Trans></Trans> tags exported from @lingui/macro (not @lingui/react). 
<h1>
  <Trans>Title</Trans>
</h1>
For text that is broken into elements, but represent a whole sentence, you must wrap it in a Trans tag so ensure the full message is extracted correctly. 
<h1>
  <Trans>
    This is one
    <span className="text-foreground/60">full</span>
    <a href="https://documenso.com">sentence</a>
  </Trans>
</h1>

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Constants outside of react components

import { Trans, msg } from '@lingui/macro';
import { useLingui } from '@lingui/react';

// Wrap text in msg`text to translate` when it's in a constant here, or another file/package.
export const CONSTANT_WITH_MSG = {
  foo: msg`Hello`,
  bar: msg`World`,
};

export const SomeComponent = () => {
  const { _ } = useLingui();

  return (
    <div>
      {/* This will render the correct translated text. */}
      <p>{_(CONSTANT_WITH_MSG.foo)}</p>
    </div>
  );
};

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Plurals

Lingui provides a Plural component to make it easy. See full documentation here. 
// Basic usage.
<Plural one="1 Recipient" other="# Recipients" value={recipients.length} />

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Dates

Lingui provides a DateTime instance with the configured locale.

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Server components

Note that the i18n instance is coming from setupI18nSSR. 
import { Trans } from '@lingui/macro';
import { useLingui } from '@lingui/react';

export const SomeComponent = () => {
  const { i18n } = setupI18nSSR();

  return <Trans>The current date is {i18n.date(new Date(), { dateStyle: 'short' })}</Trans>;
};

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Client components

Note that the i18n instance is coming from the import. 
import { i18n } from '@lingui/core';
import { Trans } from '@lingui/macro';
import { useLingui } from '@lingui/react';

export const SomeComponent = () => {
  return <Trans>The current date is {i18n.date(new Date(), { dateStyle: 'short' })}</Trans>;
};