Allow Chrome page translator to translate messages in rooms (#11113)

* support message translation in chat

* Update src/HtmlUtils.tsx

* update snapshots

* Convert TextualBody-test to use snapshots

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Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
Co-authored-by: Richard van der Hoff <richard@matrix.org>

src/HtmlUtils.tsx

@@ -423,6 +423,8 @@ export function bodyToHtml(content: IContent, highlights: Optional<string[]>, op
         "mx_EventTile_body": true,
         "mx_EventTile_bigEmoji": emojiBody,
         "markdown-body": isHtmlMessage && !emojiBody,
+        // Override the global `notranslate` class set by the top-level `matrixchat` div.
+        "translate": true,
     });
 
     let emojiBodyElements: JSX.Element[] | undefined;