With German I have Level 8 and Crown Level 37. (7 and 21, respectively, with Spanish.) What, exactly, are these numbers telling me?
The crowns are a reflection of how many skills you've completed, could be a mix of crown level ones, twos, threes and fives, depending. The level number simply reflects how many lessons you've completed. They tell you more about how much time you're spending on Duo than about how fluent you are.
they mean basically nothing :-)
8/25 levels (experience points = XP)
7/25 levels (experience points = XP)
The max crowns are max. skills x 5 + bonus-skills (only crown level L1)
You can find the max crown levels per tree on your SHOF progress page: http://www.duome.eu/Dan173745/progress