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diff --git a/packages/taler-wallet-core/src/i18n/index.ts b/packages/taler-wallet-core/src/i18n/index.ts
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+++ b/packages/taler-wallet-core/src/i18n/index.ts
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+/*
+ This file is part of TALER
+ (C) 2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Translation helpers for React components and template literals.
+ */
+
+/**
+ * Imports.
+ */
+import { strings } from "./strings";
+export { strings } from "./strings";
+
+// @ts-ignore: no type decl for this library
+import * as jedLib from "jed";
+
+export let jed: any = undefined;
+
+/**
+ * Set up jed library for internationalization,
+ * based on browser language settings.
+ */
+export function setupI18n(lang: string): any {
+  lang = lang.replace("_", "-");
+
+  if (!strings[lang]) {
+    lang = "en-US";
+    console.log(`language ${lang} not found, defaulting to english`);
+  }
+  jed = new jedLib.Jed(strings[lang]);
+}
+
+/**
+ * Use different translations for testing.  Should not be used outside
+ * of test cases.
+ */
+export function internalSetStrings(langStrings: any): void {
+  jed = new jedLib.Jed(langStrings);
+}
+
+/**
+ * Convert template strings to a msgid
+ */
+function toI18nString(stringSeq: ReadonlyArray<string>): string {
+  let s = "";
+  for (let i = 0; i < stringSeq.length; i++) {
+    s += stringSeq[i];
+    if (i < stringSeq.length - 1) {
+      s += `%${i + 1}$s`;
+    }
+  }
+  return s;
+}
+
+/**
+ * Internationalize a string template with arbitrary serialized values.
+ */
+export function str(stringSeq: TemplateStringsArray, ...values: any[]): string {
+  const s = toI18nString(stringSeq);
+  const tr = jed
+    .translate(s)
+    .ifPlural(1, s)
+    .fetch(...values);
+  return tr;
+}