WW-4799 Adding struts.date.format as a conversion format for DateConv…

[dcabasson]

…erter

[lukaszlenart]

Could you move this whole section into getDateFormats to avoid passing the globalDateFormat as a parameter? Also it would be good to extract this logic into a protected method to allow override, so the finally it should look like this:

     DateFormat[] dfs = getDateFormats(globalDateFormat, locale);

...

private DateFormat[] getDateFormats(Locale locale) {
    ...
    DateFormat globalDateFormat = getGlobalDateFormat();
    ...
}

protected getGlobalDateFormat() {
     // your code here
}

[lukaszlenart]

I will fix the outstanding issues in another PR.