This results because the field for entry of the country is not limited to a selection list. This may seem like a flaw but I think BG left is as a open field for good reasons. I have spent a lot of my corrections time working on the site map side to clear duplications and mis-spelled countries, and also to attach cemeteries to correct countries where they had not been given correct addresses when first added. There are thousands of these in countries outside the US, so no end of work to be done there.
A few examples of why this flexibility is important are the outlying territories of the US and other colonial systems. In the US they don't fit into the States/Province section. The various commonwealth/protectorate states of the Carribean are another case. Isolated Islands that are not states/provinces are another case.
Another example is the disputed areas of the world, such as West Bank and Kashmir. For some reason, BG does not auto-assign, and I think that is because Google maps has chosen not to assign those regions to a particular country.
When I first started doing corrections in this area of BG I thought we should just use the UN standards, but there are enough cases where that does not work to make me see that the open field is best. It does mean that someone needs to be scanning these on a regular basis and fixing the ones that are obviously wrong.
I do have an idea, which I have not sent to BG Support that they could rev up the search engine to return all cemeteries that have correct synonymic names, such as the ones you show in your post. As it is, when a searcher enters Austria (and they don't know about the other name) they will only get these ones with Austria, and never know if the cemetery exists under the German spelling.
I would appreciate input from other users on this question, especially those outside the US. It must be a problem for those whose native country language is being ignored.