fix: certificate translations (#1460)

## Description

Currently certificate translations on production sometimes does not show
the required language.

This could not be replicated when creating certificates on staging
(Browserless.io) and local development (Chromium), which means this fix
ultimately cannot be tested unless on live.

This is an attempt to fix it by isolating the certificate generation
into it's own context, and applying a cookie to define the required
language.

This fix is based on the assumption that there is some sort of error
which pushes the certificate to be generated on the client side, which
ultimately will render in English due to constraints on nextjs.

## Changes Made

- Apply language into cookie instead purely dynamically on SSR
- Minor unrelated fixes

## Testing Performed

Tested to ensure certificates could still be generated

packages/lib/server-only/htmltopdf/get-certificate-pdf.ts

@@ -2,13 +2,15 @@ import { DateTime } from 'luxon';
 import type { Browser } from 'playwright';
 
 import { NEXT_PUBLIC_WEBAPP_URL } from '../../constants/app';
+import type { SupportedLanguageCodes } from '../../constants/i18n';
 import { encryptSecondaryData } from '../crypto/encrypt';
 
 export type GetCertificatePdfOptions = {
   documentId: number;
+  language?: SupportedLanguageCodes;
 };
 
-export const getCertificatePdf = async ({ documentId }: GetCertificatePdfOptions) => {
+export const getCertificatePdf = async ({ documentId, language }: GetCertificatePdfOptions) => {
   const { chromium } = await import('playwright');
 
   const encryptedId = encryptSecondaryData({
@@ -32,7 +34,19 @@ export const getCertificatePdf = async ({ documentId }: GetCertificatePdfOptions
     );
   }
 
-  const page = await browser.newPage();
+  const browserContext = await browser.newContext();
+
+  const page = await browserContext.newPage();
+
+  if (language) {
+    await page.context().addCookies([
+      {
+        name: 'language',
+        value: language,
+        url: NEXT_PUBLIC_WEBAPP_URL(),
+      },
+    ]);
+  }
 
   await page.goto(`${NEXT_PUBLIC_WEBAPP_URL()}/__htmltopdf/certificate?d=${encryptedId}`, {
     waitUntil: 'networkidle',
@@ -43,6 +57,8 @@ export const getCertificatePdf = async ({ documentId }: GetCertificatePdfOptions
     format: 'A4',
   });
 
+  await browserContext.close();
+
   void browser.close();
 
   return result;