Sims 4 language and stuff pack

Hello,

I downloaded the Sims 4 and did everything, but the language is in English. How do I set it to Dutch? And how do I get the stuff pack? 
Thanks.

Here's the info on changing your in-game language:
https://games4theworld.forumotion.com/t18573-changing-the-in-game-display-language-updated-on-14-01-2016

Unfortunately, none of the content past Get Together has been released/cracked by scene groups yet. Sorry

After downloading/ installing The Sims 4, install Get to Work, then install Get Together and then the hotfix for the Get Together and... the final step play the game or change the language and then play the game.

Hello, and welcome to the forum, 
for changing language follow @pixistix's solution.
If you installed The Sims 4 in thiis order: Base Game -> Get to Work -> Get Together -> Hotfix then you have these packs:
Pools, Ghosts, Basements, Newcrest neighborhood, etc...
Holiday Celebration Pack
Spa Day
Outdoor Retreat
Luxury Party Stuff Pack
Perfect Patio Stuff Pack
Cool Kitchen Stuff Pack
Spooky Stuff Pack, and of course Get to Work and Get Together.

Please note that for TS4, Games4theworld does not create those actual updates. Hence we cannot tell when a release will come. Experience shows that the scene groups (the people who create game cracks) will skip minor updates for The Sims 4, or at least take longer for releasing them. All we can do is wait, I guess, and enjoy what is already there.

The reason these pirated releases come in "irregular" intervals is because The Sims 4 is probably the least popular game version of the entire Sims-franchise. And if there is not enough interest/demand, then the people who create these pirated updates will naturally focus on other projects - than Sims 4.
There are no pirated versions available as of yet...so yes, we all need to wait.
For more information read this post.