How to change default language in shopware6 from backend?

I actually found a workaround.

Systemlanguage is stored in the code itself not in the catabase. 

If you want to change the Systemlanguage do the following:

  1. Go to the Table Language in your DB
  2. Copy the id of your Systemlanguage
  3. Make sure to remove the 0x prefix of the ID
  4. Search your Code for the ID you’ve copied before
  5. You should be able to find the ID in the following Files: common.js, Defaults.php, shopware.js and common.js
  6. I replaced the ID with the one i wanted as default Language in the above Files

Be aware that might not be safe to do this option and make a backup before.

For me this Solution worked, i just needed to set all Names of Product and so on in the Default Language 

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