Just trying to entirely disable localization support of a site.

Tried removing the gettext-filter, using override_load_textdomain-filter, and looked into every possible site with no luck. Can this be disabled entirely without hacking the core?

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You already have the answer, but perhaps you're not running your code early enough.

Returning true from the override_load_textdomain filter will prevent all MO files from loading, but you'll have to run it early to catch WordPress Core translations. Adding it as a must-use plugin does the trick for me:

 Plugin Name: Disable Gettext

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