Hi. If you need it "live" and don't mind doing it one at a time, you can use the Wikimedia API. You can read here for more info: https://www.mediawiki.org/wiki/API:Properties#langlinks_.2F_ll

For example, here's the API call to get all langlinks for https://simple.wikipedia.org/wiki/Earth: http://simple.wikipedia.org/w/api.php?action=query&prop=langlinks&titles=Earth&lllimit=500

If you need to do a lot of them at once, then you are better off trying to download a wikidata dump and working on it from your machine. I don't think remember if the data is presented simply, so you may have to do some exploration. You'd start off with the extension here: https://www.mediawiki.org/wiki/Extension:Wikibase . The dump is here https://dumps.wikimedia.org/wikidatawiki/

If you're comfortable with SQL, you can try doing it with XOWA at http://xowa.sourceforge.net . It'll probably be easier than working with wikibase and the dump. You'd have to do the following:

- Import the www.wikidata.org dump at home/wiki/Help:Import/List (about 1 hour)
- Open up the followng file in a sqlite shell: /xowa/wiki/www.wikidata.org/www.wikidata.org.003.sqlite3
- Run the following SQL

--create an index for faster lookup. this may take 20 min
CREATE INDEX wdata_qids_trg_ttl ON wdata_qids (wq_trg_ttl, wq_src_wiki, wq_src_ns, wq_src_ttl);
--run the SQL to get the links for Earth
SELECT q.* FROM wdata_qids t JOIN wdata_qids q ON t.wq_trg_ttl = q.wq_trg_ttl WHERE t.wq_src_wiki = 'simplewiki' AND t.wq_src_ns = '0' AND t.wq_src_ttl = 'Earth';

The last statement produces something like the following:

abwiki,0,"Адгьыл",q2
acewiki,0,"Bumoë",q2
afwiki,0,Aarde,q2
alswiki,0,Erde,q2
amwiki,0,"መሬት",q2
angwiki,0,"Eorðe",q2
anwiki,0,Tierra,q2
arcwiki,0,"ܐܪܥܐ",q2
arwiki,0,"الأرض",q2
arzwiki,0,"الارض",q2

Hope this helps.