Fix numbers being formatted wrong on some machines [DEV-5]

My system is configured to use German causing the method to use the wrong decimal seperator for the given format

Core/src/main/java/com/songoda/core/utils/NumberUtils.java

@@ -15,6 +15,7 @@ public class NumberUtils {
         // This is done to specifically prevent the NBSP character from printing in foreign languages.
         DecimalFormatSymbols symbols = decimalFormatter.getDecimalFormatSymbols();
         symbols.setGroupingSeparator(',');
+        symbols.setDecimalSeparator('.');
 
         decimalFormatter.setDecimalFormatSymbols(symbols);
         return decimalFormatter.format(number);