Moved structure elements tags to internal tags set: a structured tag is defined by the root tag, sometimes there is no need to use a traditional tag as a sub-element, since the purpose of the element is unique. For instance language strings lists implicitly have a language code and a text holding the string, it makes more sense to define a set of generic tags at the internal level, rather than adding then to the whole shebang of offset management. Not sure yet, however, if all is OK, it is apparently importing without problems, so this could be a fixed issue.