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Missing Translations, Cut-Off Text and Local Formats in Each Language

Certyn walks your app in each language you support and files untranslated text, text that does not fit, and wrong date, number and price formats.

For teams with a translated web app who want to know what breaks in each language.

Your setup

  • A web app on staging in English, German and Japanese.
  • The language is picked by a switch in the app, by the URL (/de/), or by the user's profile.

Say this to Certyn

Check checkout and account settings on staging in German and Japanese. Our language switch is in the footer. File missing translations, cut-off text and wrong date or price formats.

What Certyn does

  1. Asks how your app picks the language, if you did not say. Certyn cannot change the browser's own language, so this decides the path. It can keep the answer as a memory.
  2. Says the run length and starts an explore run with your pages and languages in the goal (app.run.create type explore).
  3. Switches the language your app's way: the switch, the URL, or a test account set to that language (see the recipe on roles).
  4. On each page, looks for text left in English, raw keys such as checkout.title, placeholders such as {name} or undefined, and broken characters.
  5. Looks for text cut off or overflowing buttons, menus and tables, also at a phone size (browser.device.set).
  6. Checks dates, numbers and prices in the local format, for example 20.10.2026 and 1.234,56 € in German. If you support Arabic or Hebrew, it checks the right-to-left layout.
  7. Files one issue per real bug, with the language, page and a screenshot.

What you get

  • Issues by language and page, with screenshots.
  • A run report with each language and page checked.

Limits

  • Runs cannot set the browser's language (Accept-Language). If your app takes the language only from the browser, a run sees the default. Add a URL parameter or a setting for testers. Or Certyn runs a short Playwright script on its Machine with a locale such as de-DE and checks the text. It does not see that script's screen, so layout is checked only by element sizes.
  • Dates and numbers that follow the browser's language show the default format in runs.
  • Certyn finds clear mistakes. It is not a native speaker review of tone and meaning.
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