Translate ":/Charts.XML" during import

... translate the names and units for Metrics and PMmetrics to the
locale of GC-preferences
... translate ONLY once if the default-chart is imported
Translate ":/-Layout.XML" metrics charts

... second part: 2nd part ("-Layout.XML") translation
... "Mapping Table generation" provided as a new LTMTool routine (to
avoid duplicate code)
... mapping to HomeWindow::restoreState(bool useDefault) for the LTM
Window type charts added
... metricUnit considered in getting the mapping texts for "unit"
Merge pull request #979 from Joern-R/pull3

Translate ":/Charts.XML" during import