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Provide tools for translation and display of text in multiple languages and support for regionalization/localization for dates, numbers, currency, measurement, or other local contexts.
provides multilingual versions of all entity types that support translation
generates separate search index items for all/selected available languages for each translatable entity (this also includes a separate item for LANGUAGE_NONE data)
allows per-index configuration of language-related behavior
introduces new datasource controller for multilingual entities
RTL means Right to Left, it's a term used to describe the status of the interface when viewing it in a language like Arabic (right to left written langauge).