Makefile - don't rebuild .PO/.MO files unnecessarily
Non-gregorian/julian dates create incorrect statistic charts
Chart 'Average number of children per family' shows invalid dates in 1st century
Remove unnecessary LEFT JOIN
Typo - wrong column name
Fix: negative number of children shown in chart 'Fix: negative number of children shown in chart'
Years misformed in statistics charts
Shorter/simpler y-axis titles