What does your posting have to do with Hungary?
The UK do have possessions on the Island of Cyprus. Whether this is a mistake this you will have to discuss with other people. GeoNames only models the political facts, not whether they make sense.
For massive updates the best and easiest would be to find the corresponding data from the official authorities. It would be great if you could help us locate this information. Administratrive divisions are often found on the websites of the national statistical office (even boundary information is often found there). Populated places and other features are normally managed by a national mapping agency.
I have received some complaints about your updates. Are you sure your updates to Admin division are correct? You have changed a couple of populated places to admin division. Does it mean those populated places do not exist? Villages and cities are in first place 'populated places', if there is also an admin division then it is a separate feature.
I have marked '"The City of Angels" as 'colloquial. The browser was returning the main toponym name, whereas the api returns the English name. Both names had the language code 'en' but there was no flag to mark one as more important then the other.