Translation for the combo box's loading message.
#94810: We take into account the region when filtering comunas in the Proyectos Sea search.
#94810: We dont add a filter if the widget's value is the widgets empty message, and don't create a filter conjunction if there is only a filter.
#94810:  We skip creation of filters if the widget's value is the widgets empty message.
#94810: Changed the way change handlers are created, so we pass -1 as the selected index if the widget's value is null. Also, we handle the valid event, which launches inmediately after the comboboxes change, even when its done programatically using setValue (which the select event skips) and not requiring the widget to lose focus (as required by the change event)
Merge pull request #290 from luisromangz/94810-StoredSearchFormResettingAndMoreFixes

#94810 stored search form resetting and more fixes