geography activities, added a translation message
Updated Spanish translation by software maintainer

There was a minor error, in the string USA|Georgia, the prefix
before the pipe is a disambiguation context that must not be
translated. I added a translator message to clarify.
lang word image, remade the alphabet image
lang activity, exercise level 2 changes

At exercise level2 the question is no more displayed
but the text is in the choices.

Improved some colors.