Especially on multi-language sites (such as Mediawiki.org), users may participate in discussions posting on different languages. When that happens, users that do not speak that language usually make use of an on-line automatic translation service to get a general idea of the given message. That adds another barrier for participation.
An option to "view translation in X" (being X a language the user understands) would be helpful. It will save the user the steps of copying the whole message, going to an external website losing the links and format in the way). This is a common pattern users may have experienced in other sites such as [[ https://help.twitter.com/en/using-twitter/translate-tweets | twitter ]] or [[ https://www.facebook.com/help/509936952489634 | facebook ]].
Considering that ContentTranslation already provides an automatic translation service (based [[ https://www.mediawiki.org/wiki/Help:Content_translation/Translating/Initial_machine_translation#Machine_translation_availability | on multiple translation providers ]]) for some languages, providing the above capability should be possible (as long as the language of the original message can be identified).
In order to simplify the process for the user, it may be convenient to auto-detect the source language based on content: {T99666}