Delta manual calibration menu

Based on http://minow.blogspot.com/index.html#4918805519571907051

To test/enable, uncomment the #define DELTA_CALIBRATION_MENU in Configuration.h
Menu should only show up when not actively printing (similar to the Prepare menu entry changing to Tune while printing)

Included untranslated (english) strings in language files to satisfy build in all languages.