Merge jsgantt extension in 4.2

Hi Sunnavy,

attached a set of patches I’ve done for another project.
Maybe you find them useful.

-Chris

0001-bugfix-in-parseDateStr-with-ISO-date-format.patch (908 Bytes)

0002-bugfix-day-chart-header-with-ISO-date-format.patch (1.67 KB)

0003-show-day-and-month-always-with-two-digits.patch (1018 Bytes)

0004-show-year-always-with-4-digits-in-week-month-and-quarter-format.patch (2.29 KB)

0005-localization-for-jsgant.js-by-mason.patch (10.8 KB)

0006-only-open-window-if-link-is-set-and-minor-cleanup.patch (1.28 KB)