Comment 1 for bug 1006781

Otmar, you might want to raise this on the forum, but I can tell you something about these issues here as well. They are not truly "bugs", though I am sure they are incorrect for you.

Many of these are issues with translations. These should be handled by proposing different translations in the translation system here on Launchpad. Anyone can suggest a new translation, and then the German translation team leader will consider if to approve it. (https://translations.launchpad.net/webtrees)

But some of the problem is that the existing relationship code is not perfect (though better than almost any other software in the world). Greg has plans to change it, so you should get involved in the discussions. Read http://webtrees.net/en/forums/8-translation/23242-translation-into-dutch especially post #9 by Greg. Do not think because its title includes "Dutch" that it is just about that language. It is not. It is about relationships in all languages.

A separate problem is your comment "Another problem is, the PHP-server hangs sometimes with complex calculations of the relationship."
We agree. It is the most resource-hungry page in the entire system. In part the changes proposed by Greg will help this. In part, we need a completely new way to compute relationships. Greg has experimented with some, but they all have limitations. The biggest is that they require versions of MySQL most web hosts do not yet implement.

We believe that with these improvements, your final suggestion for de-selecting non-blood relations will never be necessary.

For all these reasons, I urge you to discuss the issues on the forum, and propose translation changes in the translation system. For these reasons, and NOT because we disagree with anything you say, I will mark this "bug" as a "wishlist" item.