docs: add README for locales

src/locales/README.md

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+# Ory Elements Default Translations
+
+This directory contains the default translations for Ory Elements. These
+translations are also used in the Ory Cloud Account Experience. Missing
+translations automatically fall back to the English version.
+
+## Automation
+
+The English base language file is auto-generated from various sources. Please
+update it by running `npm run generate-locales`.
+
+## Contributing
+
+If you want to contribute to the translations, please open a PR with the new or
+updated translations. We appreciate your help!
+
+Please use formal language and avoid slang or colloquialisms. This ensures that
+the translations are suitable for all use-cases.
+
+## Customizing Translations
+
+For details on how to use custom translations with your Ory Elements based
+custom UI, please refer to the [README.md](../../README.md#internalization-i18n)
+in the root of this repository.