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Here are a couple of good options, if you like doing your own code…or you can get a plugin to do the work for you. So that’s 3 options…

The first 2, one is a pop-up, and the 2nd is a redirect to a thank you page…

1. https://stackoverflow.com/questions/16250596/successful-fail-message-pop-up-box-after-submit
2. https://stackoverflow.com/questions/1438722/thank-you-alert-upon-form-submission
See if any of that helps, and let us know along what lines of a solution you are looking for, because as you can see, there are many approaches.

And of course, once you decide, you output your message:
Ihr Kommentar wartet auf Moderation in deutscher Sprache. ??

Hello

If you want to translate your theme into other language, inside evolve theme languages directory. Find your related file and updated your language string.
Below is guild line how to translate wordpress theme:
https://premium.wpmudev.org/blog/how-to-translate-a-wordpress-theme/

Thank you