localization-i18n

ICU MessageFormat provides standardized syntax for handling plural rules, gender selections, and nested translations. You use it to define locale-aware message patterns that adapt dynamically based on CLDR plural categories like one, few, many, and other.

Setting up react-intl or i18next involves configuring locale providers, defining message catalogs, and integrating FormatJS components. These libraries handle locale-aware date and number formatting, message extraction, and translation pipeline integration for multilingual React applications.

RTL layout support requires configuring directional CSS properties, logical properties like margin-inline-start, and locale-aware component mirroring. You handle RTL by setting the dir attribute on HTML elements and adapting layouts for languages like Arabic, Hebrew, and Persian.

Translation management systems integrate with structured translation pipelines by consuming standardized message catalog formats. You export strings from your application, route them through TMS workflows for translator review, and import completed translations back into your locale catalogs.

CLDR plural rules are required when formatting locale-aware content that involves quantities, as different languages have varying plural categories. For dates and numbers specifically, you rely on ICU and FormatJS formatters that reference CLDR data for locale-correct output.

Incorrect pluralization in ICU MessageFormat typically occurs when message patterns do not account for all CLDR plural categories required by a specific locale. You must ensure your translation files include all necessary plural forms, such as one, few, many, and other, for each supported language.