How to remove & reason for pseudo duplicate entries in govdata.de SPARQL-Query

Question

I have the following very simple query. The query can be testet at: https://www.govdata.de/web/guest/sparql-assistent After looking at the data I saw that there are pseudo duplicate entries which I don´t understand.

PREFIX dcat: <http://www.w3.org/ns/dcat#>
PREFIX dct: <http://purl.org/dc/terms/>
SELECT DISTINCT *
WHERE {
>     ?dataset a dcat:Dataset .
>     ?dataset dct:title ?title .
>     ?dataset dct:description ?description .
> }

An example for the data is the title (You can just search for it after apllying the query in the sparql-assistent: "100m-Höhenlinien Wuppertal 2015" There will be two entries: "100m-Höhenlinien Wuppertal 2015"@de "100m-Höhenlinien Wuppertal 2015"

Where is the difference, what does @de mean / where does ist come frome? I don´t know which field it could be, I checked some fields inside of the the documentation of the data: https://www.dcat-ap.de/def/dcatde/2.0/spec/ But no luck so far.

In the web-portal-search (https://www.govdata.de/) you can only see one entry, so I am a bit confused. There are many datasets where the title is doubled, but most are also doubled inside of the normal portal.

---

More a second question: In the web-portal I also don´t know how to say which 'dataset' field is which URL in the web-portal. A good example: https://www.govdata.de/web/guest/suchen/-/details/gerichte8e8c3 https://www.govdata.de/web/guest/suchen/-/details/gerichte-2021-07-13 --> There are even more entries, the also have different metadata. But I don´t know how I get from 'dataset' to one of the stated URL above.

I tried to look at different metadata-fields. I did expect that I find there any details. I am new to SPARQL, so I think it is primariy a knowledge problem.