Set release date for text translator 2.0.0b1 in CHANGELOG (#44588)

* Release date for text translator 2.0.0b1

* correct python namings

---------

Co-authored-by: Jiarui Guo <[email protected]>

Author: jrjrguo

sdk/translation/azure-ai-translation-text/CHANGELOG.md

@@ -1,19 +1,18 @@
 # Release History
 
-## 2.0.0b1 (Unreleased)
+## 2.0.0b1 (2026-01-08)
 
 ### Features Added
 
-- Added support for the latest Azure AI Translator API, including translations using LLM models, adaptive custom translations, tone variant translations, and gender-specific language translations.
+- Added support for the Azure AI Translator API 2025-10-01-preview, including translations using LLM models, adaptive custom translations, tone variant translations, and gender-specific language translations.
+- Added `TranslationTarget` for configuring translation options.
 
 ### Breaking Changes
 
 - Dictionary, sentence boundaries and text alignments features have been removed, and relevant models and properties have been removed.
-- 
-
-### Bugs Fixed
-
-### Other Changes
+- Added `models` property to `GetSupportedLanguagesResult` to include the list of LLM models available for translations.
+- Renamed property `confidence` to `score` in `DetectedLanguage`.
+- Removed property `source_text` in `TranslatedTextItem`.
 
 ## 1.0.1 (2024-06-24)
 

sdk/translation/azure-ai-translation-text/README.md

@@ -75,7 +75,7 @@ A `TextTranslationClient` is the primary interface for developers using the Text
 
 ### Input
 
-A **text element** (`string`), is a single unit of input to be processed by the translation models in the Translator service. Operations on `TextTranslationClient` may take a single text element or a collection of text elements.
+A **TranslateInputItem** is a single unit of input to be processed by the translation models in the Translator service. Each `TranslateInputItem` defines both the input string to translate and the output specifications for the translation.
 For text element length limits, maximum requests size, and supported text encoding see [here][translator_limits].
 
 ## Examples