merge_pr_50208

Translator: Implement sourceLanguage and targetLanguage attributes

Implements the sourceLanguage and targetLanguage attributes.

Bug: 391439683
Change-Id: I7dde1a78de30ad959ca92ee424596fb7442786b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6186019
Commit-Queue: Nathan Memmott [email protected]
Reviewed-by: Ming-Ying Chung [email protected]
Cr-Commit-Position: refs/heads/main@{#1409688}