v2.6.1: Fix "highest flight today" layout collision on Statistics screen

The v2.6.0 addition was drawn as a single line that could overflow
and collide with the "Reset logbook data" button. It now uses the
same two-line drawStatRow() layout (label + value) as the other
stats, with all row Y positions shifted up slightly to make room,
and the i18n strings dropped their now-redundant ": " suffix since
drawStatRow() renders label and value on separate lines.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/i18n_de.h

@@ -117,7 +117,7 @@ static const char* const I18N_DE[] = {
     "Nochmal tippen zum Bestätigen!",
     "Flugbuch-Daten zurückgesetzt.",
     "Laufzeit: ",
-    "Höchster Flug heute: ",
+    "Höchster Flug heute",
     "Verlauf (letzte 7 Tage)",
     "Noch keine Flugbuch-Einträge.",
     "Wie der Verlauf funktioniert",