Does T8916 help?

Do you mean the patch, added by devurandom ? The first part of the patch ($default...) is not existing in my PhabricatorAccountSettingsPanel.php

This is the full code of the file in my case.

<?php

final class PhabricatorAccountSettingsPanel
  extends PhabricatorEditEngineSettingsPanel {

  const PANELKEY = 'account';

  public function getPanelName() {
    return pht('Account');
  }

  public function getPanelGroupKey() {
    return PhabricatorSettingsAccountPanelGroup::PANELGROUPKEY;
  }

  public function isManagementPanel() {
    return true;
  }

  public function isTemplatePanel() {
    return true;
  }

}

Let me add some note: A changing of the "Translation" - Dropdown in the individual account settings never makes a change. So it is not important if i choose german or something else. That is not influencing my request, but is that a normal behaviour? Or did i maybe make a mistake when i set up the system?

My bad I didn't see the second comment by @chad. I know it is possible as @epriestley changed the language of this instance (see D16310#190724).

No i realized, that the File with the translation has to go to the "/root/libphutil/src/extensions" Folder, some Values are translated in the ui, but others aren't. Is there a file, where i can find all strings, to translate it? Or is there another way to find out how to translate a specific string?

You'll need to run arc liberate to pick up the new file so Phabricator can find it or put it in src/extensions. Then if you're an admin, go into Settings -> Global Default Settings, and change the install language there.

bin/i18n extract can extract strings for translations.

Translations are not really supported by the upstream, so these tools are 'use at your own risk'. If you have additional questions, see Support Resources or use Ponder.

I am so sorry, if my comments look a little bit "dumb".

But if i input arc liberate to my console, it just returns not to know this command. So i think i got something wrong.

i18n extract ran, but what is the result? Is there a file or something like that, which i can take to translate? Where do i find it? For now i am done with my questions. Sorry for putting this to here.

You should install arc. arc is the script in arcanist/bin/arc