The quick way - but you have to know the three letter code of your language:
1. See the part
"all" in the URL
https://www.opensubtitles.org/en/ssearch/sublanguageid-
all/idmovie-72490
2. Replace this by you language, for example
"dut" for Dutch, and you will get
https://www.opensubtitles.org/en/ssearch/sublanguageid-
dut/idmovie-72490
3. From here you can download the subs in your language by episode or by season.
The natural way to get there is:
1. Go to some episode of this tv-series, for example the pilot https://www.opensubtitles.org/en/search/sublanguageid-all/imdbid-1940498
2. In that list, click on the flag of your country/language.
3. Click
"All subtitles for this TV Series"
Note that you can set a preferred language in your profile page.
If you do, all search results will include only that language.
Edit:
Sorry. I am The-King-of-Making-Easy-Stuff-Difficult.
Some very good friend of mine, who prefers to remain anonymous (modesty, I guess), pointed out to me that things are actually quite easy:
Change the search field option to your language and then search, you got those results cos you left it as 'all.'