made Saturday week first day

uhabits-android/src/main/java/org/isoron/uhabits/activities/common/views/HistoryChart.java

@@ -459,6 +459,7 @@ public class HistoryChart extends ScrollableChart
     private void updateDate()
     {
         baseDate = DateUtils.getStartOfTodayCalendar();
+        baseDate.setFirstDayOfWeek(Calendar.SATURDAY);
         baseDate.add(Calendar.DAY_OF_YEAR, -(getDataOffset() - 1) * 7);
 
         nDays = (nColumns - 1) * 7;

uhabits-core/src/main/java/org/isoron/uhabits/core/utils/DateUtils.java

@@ -108,6 +108,7 @@ public abstract class DateUtils
         String[] days = new String[7];
 
         Calendar calendar = new GregorianCalendar();
+        calendar.setFirstDayOfWeek(SATURDAY);
         calendar.set(DAY_OF_WEEK, calendar.getFirstDayOfWeek());
         for (int i = 0; i < days.length; i++)
         {
@@ -127,6 +128,7 @@ public abstract class DateUtils
     {
         Integer[] dayNumbers = new Integer[7];
         Calendar calendar = new GregorianCalendar();
+        calendar.setFirstDayOfWeek(SATURDAY);
         calendar.set(DAY_OF_WEEK, calendar.getFirstDayOfWeek());
         for (int i = 0; i < dayNumbers.length; i++)
         {