I searching translated versions of the tx_news translation files. When I open ext/news/Resources/Private/language/ all I find are the default (english) versions of the xlf Files.
I am sure there are translation files in other languages for tx_news, but I was not able to find them. How can I find them? Or can I get them somehow in the backend?
You can get them in the backend - there is the Language module in the menu, where you can set the list of languages for your installation, and download or update the translation files.