Fixed the duplicate slots view.
The script would not clear the screen upon recalculation also the list of duplicates would increase with every iteration because the variables weren't properly reset.
Patch by: Merio Ferraro, Lennard de Rijk
Reviewed by: to-be-reviewed
tinyMCE.addI18n('en.xhtmlxtras_dlg',{
attribute_label_title:"Title",
attribute_label_id:"ID",
attribute_label_class:"Class",
attribute_label_style:"Style",
attribute_label_cite:"Cite",
attribute_label_datetime:"Date/Time",
attribute_label_langdir:"Text Direction",
attribute_option_ltr:"Left to right",
attribute_option_rtl:"Right to left",
attribute_label_langcode:"Language",
attribute_label_tabindex:"TabIndex",
attribute_label_accesskey:"AccessKey",
attribute_events_tab:"Events",
attribute_attrib_tab:"Attributes",
general_tab:"General",
attrib_tab:"Attributes",
events_tab:"Events",
fieldset_general_tab:"General Settings",
fieldset_attrib_tab:"Element Attributes",
fieldset_events_tab:"Element Events",
title_ins_element:"Insertion Element",
title_del_element:"Deletion Element",
title_acronym_element:"Acronym Element",
title_abbr_element:"Abbreviation Element",
title_cite_element:"Citation Element",
remove:"Remove",
insert_date:"Insert current date/time",
option_ltr:"Left to right",
option_rtl:"Right to left",
attribs_title:"Insert/Edit Attributes"
});