Spelling - especially commas.

Created by: garloff

• Enumerations in English have a comma also in front of the last item that comes prefixed with an "and" or an "or". We want a, b, and c.
• No comma in statements like "We are convinced that".
• I took the liberty to replace wide public with wider public. I believe the intention is to compare the small internal audience with the larger outside one (thus: wider), without necessarily wanting to make a statement about the absolute size (wide).
• I resisted the temptation to replace experiences ("Erlebnisse") with experience ("Erfahrung", "Erfahrungen") -- however, we might consider this. The uncountable word experience is slightly different in its meaning.

This is merely in preparation of a native speaker reviewing the text for errors and -- more importantly -- style consistency.

Signed-off-by: Kurt Garloff kurt@garloff.de