In preparation for supporting `equiv-text` placeholder information in extracted translation files, this commit adds these optional properties to the `ParsedMessage` interface and updates `parseMessage()` to be able to store them. PR Close #38536
In preparation for supporting `equiv-text` placeholder information in extracted translation files, this commit adds these optional properties to the `ParsedMessage` interface and updates `parseMessage()` to be able to store them. PR Close #38536