oneThis plural form is used for numbers like: 1
Repeat every %1$d week
otherThis plural form is used for numbers like: everything else
Repeat every %1$d weeks
Repetir cada %1$d semana: %2$s
Repetir cada %1$d semanas: %2$s
Repeat every %1$d week
Repeat every %1$d weeks
Repeat every %1$d week
Repeat every %1$d weeks
Repetir cada %1$d semana: %2$s
Repetir cada %1$d semanas: %2$s
%1$d - number, %1$d may be skipped for singular if translation looks better.%2$s - name of week day