Redmine

Change from:
label_in_the_next_days: in the next
label_in_the_past_days: in the past

If you mean something like "in the next days" (like in the french translation)
change to:
label_in_the_next_days: in den nächsten Tagen
label_in_the_past_days: in den letzten Tagen

If you mean something like "in the next" (like in the english translation)
change to:
label_in_the_next_days: in den nächsten
label_in_the_past_days: in den letzten

Best regards,
Daniel