I scrolled through my stats and saw that the fairly new "Average D/T per year" section is arranged as one column with a scroll bar instead of one column, like the rest (at least in German).
I reckon the scroll bar is due to the very long "Durchschnittliche Schwierigkeit"/"Durchschnittliches Gelände", but there seems to be a spacing bug as the bars of Avg D kind of overlap with the year of T:
I also looked into the Crowdin translation strings - there is a shorter version approved ("Mittleres Gelände") which is used directly above, but somehow not implemented here.
I'll also suggest "Mittlere Schwierigkeit" on Crowdin.
There's another option: To display "average" via ø (unicode U+2300, Diameter Sign). This would save enough space even in languages with longer words...