- fixed tab widget to use id instead of label
- added attribute names for describtion (label) in xul_io, to export them as single attributes not comma-sep. as options
- added translate: true to description/label title
--> xet-files need to be dumped new, to get the tab-ids
--> seems like describtion value is translated unconditional, it should only be translated if no_lang attribute is not set or false, while label attribute is always translated (Andreas?)