More markers on the same spot?

One more question: is there a way to use this component in a multi-language website?

1.Is there a link to open more details in a dedicated page. I'm familiar with your extension MyMaps Location, where I have quick details and I can then click to open ALL other location details.
yes it will location and show more details page this can be menu same like my map locations.

2.What happens when more than one marker point to the same town?
you need to adjust little marker/dot.the 2 location at same position are not working as per your expectations.also in the tooltip you can provide details of both 2 locations.
3.If I want to show all the regions of a country (like you did for France in your demo page), is there a quick way or shall I add them one by one?
No you need to add them one buy one.we love to give shortcut but these are very specific requirements.
4.One more question: is there a way to use this component in a multi-language website?
multi language works like the way it is working in normal joomla extension with language.