fix: shorten dashboard labels to "Burned" and "Covered"

Values already include units (kcal, km), so verbose labels were redundant.
Remove unused distance_covered i18n key.

src/lib/js/fitnessI18n.ts

@@ -72,8 +72,9 @@ const translations: Translations = {
 	workouts_plural: { en: 'Workouts', de: 'Trainings' },
 	lifted: { en: 'Lifted', de: 'Gehoben' },
 	est_kcal: { en: 'Est. kcal', de: 'Gesch. kcal' },
+	burned: { en: 'Burned', de: 'Verbrannt' },
 	kcal_set_profile: { en: 'Set sex & height in', de: 'Geschlecht & Grösse unter' },
-	distance_covered: { en: 'Distance Covered', de: 'Zurückgelegt' },
+	covered: { en: 'Covered', de: 'Zurückgelegt' },
 	workouts_per_week: { en: 'Workouts per week', de: 'Trainings pro Woche' },
 	sex: { en: 'Sex', de: 'Geschlecht' },
 	male: { en: 'Male', de: 'Männlich' },