The SharedRenderer fails to get the Default Locale when a headerDateFormat is specified

When the t:schedule specifies the "headerDateFormat" attribute, the Shared Renderer doesn't use the default locale, instead, it only creates a new SimpleDateFormat. Patch provided:

AbstractScheduleRenderer.java

Change
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format = new SimpleDateFormat(pattern);

To
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if (context.getApplication().getDefaultLocale() != null)

{ format = new SimpleDateFormat(pattern, context .getApplication().getDefaultLocale()); }

else

{ format = new SimpleDateFormat(pattern); }