Freeciv

I think we should have some tooltip also for wonders. That way user first checking with a wonder would notice that there are tooltips associated with these entries and would then check it for non-wonders too. As it's now, user probably looks around the city dialog in her initial town and concludes that there is no tooltips for the buildings as that's the situation with the Palace.
First I thought something like "Wonders cannot be sold", but maybe even better is to have different message for Small Wonders and Great Wonders, for the sake of users who are not familiar with the Small Wonder concept and who would not understand why Palace is called wonder. So, my proposal is "Small Wonder - cannot sell" and "Great Wonder - cannot sell".

Minor style nit: Add space between "/*" and first character of the comment, likewise between last character and "*/"