testland/pseudo-localization-runner

Configures pseudo-localization for the app (replaces translatable strings with accented variants like "Submit" → "Şüƀɱîţ" + 35% length expansion) - surfaces UI issues without needing actual translators: hardcoded strings, truncation, encoding, and bidi handling. Use when preparing an app for translation (i18n / internationalization), validating l10n infrastructure, or when the user mentions pseudo-localization or localization testing.

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Manual pseudo-localization transform

If no pseudo-localization library exists for your stack, transform the source locale file locally with a one-time pass:

function pseudoLocalize(s) {
  const map = { a: 'à', e: 'è', i: 'ì', o: 'ò', u: 'ù',
                A: 'Á', E: 'É', I: 'Í', O: 'Ó', U: 'Ú',
                s: 'š', t: 'ţ' };
  let out = '';
  for (const c of s) {
    out += map[c] || c;
    if ('aeiouAEIOU'.includes(c)) out += c;   // duplicate vowels for the length expansion
  }
  return `[${out}]`;   // delimiters help spot incomplete wraps
}

Run it over the source locale file and load the output as the pseudo-locale. The [...] delimiters make unwrapped strings obvious, and the duplicated vowels drive the length expansion (the 35% convention defined in Step 2).