chore: import upstream snapshot with attribution

client/tools/create-i18n.ts

@@ -0,0 +1,54 @@
+// Copies non-English client translation files from the i18n-curriculum
+// submodule into client/i18n/locales/<locale>/ so that all translations
+// resolve from a single base path regardless of locale. English files
+// already live in client/i18n/locales/english/ and are skipped.
+//
+// This script expects client/config/env.json to exist (created by
+// create-env.ts) and reads clientLocale from it.
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+const envPath = path.resolve(__dirname, '../config/env.json');
+const env = JSON.parse(fs.readFileSync(envPath, 'utf8')) as {
+  clientLocale: string;
+};
+const { clientLocale } = env;
+
+if (clientLocale === 'english') {
+  // If the locale is english the files already exist.
+  process.exit(0);
+}
+
+const filesToCopy = [
+  'translations.json',
+  'intro.json',
+  'meta-tags.json',
+  'motivation.json'
+];
+
+const srcDir = path.resolve(
+  __dirname,
+  `../../curriculum/i18n-curriculum/client/${clientLocale}`
+);
+const destDir = path.resolve(__dirname, `../i18n/locales/${clientLocale}`);
+
+if (!fs.existsSync(srcDir)) {
+  console.error(
+    `Source directory not found: ${srcDir}\n` +
+      'Has the i18n-curriculum submodule been initialized? ' +
+      'Run: git submodule update --init'
+  );
+  process.exit(1);
+}
+
+fs.mkdirSync(destDir, { recursive: true });
+
+for (const file of filesToCopy) {
+  const src = path.join(srcDir, file);
+  if (!fs.existsSync(src)) {
+    console.error(`Source file not found: ${src}`);
+    process.exit(1);
+  }
+  fs.copyFileSync(src, path.join(destDir, file));
+}