attempt to fix an error seen live by some students
less fuzzy specification of the function
replace tab chars with 4 spaces (no real change)
Basic i18n infrastructure allowing to translate the user interface.

This fixes issue #76.
increase the paranoia of the entity parser to avoid broken entities. This fixes issue #62
fix all remaining broken entities wrt B/E TEMPLATE mechanism
remove a debugging message
Kill the ability to have more than one view per world (fix issue #35)