provide the option to choose the language for the names on the Slippy Map
Kai Krueger commented
It would be nice, but this it probably is to computationally / disk space expensive to do easily in the current setup. Adding one or two of the most common languages (like perhaps English) might be possible at some point though.
Wikipedia have tried it on their toolserver ( http://cassini.toolserver.org/tile-browse/ ) to offer OSM maps for all the languages that wikipedia supports. It has been of variable success though, and we have to see how it develops after the reorganisation of the wikimedia-osm-toolserver.