fixes #1755: don't translate toolbar names

in InitGui.py of Arch and Spreadsheet
Fixed bug introduced by last commit
fixes #1744 Use unicode in Unit system
fixes #1745 Encode Annotation Text using latin1

for Coin Versions <= 3
use exception for an out of range GeoId in sketcher

instead of using an assertion which causes the prgram to exit
when adding geometry or in a doc.recompute