I assume you have the special German keyboard with special German characters. I have the standard UK layout but sometimes need to type certain language specific characters (irish, polish, german, spanish etc.) and the only way to achieve this is by using the combination of a letter and Alt-Gr. That's when the conflict with the default Illustrator keyboard shortcuts occurs and, unfortunately, AI doesn't have a shortcut override while editing the text (which would solve the problem). The only way to fix that at the moment is the remapping of the AI shortcuts to free up the special character letters. I wish that AI creators kept in mind that a large group of their users doesn't come from US and that they type in different languages, sometimes a few of them at the same time, and you can't own a special keyboard for each of them. I know that I could type my text outside of Illustrator and then paste it in afterwards but that's not a correct way to do it, just workaround.
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