1. Not currently, the only semi-decent offline OSM map for desktop OS is Gnome Maps. [0]

2. You can't configure the way maps appear on openstreetmap.org. You (or someone) will have to render the map tiles to display all names in English instead of the local language. [1]

3. If you mean keeping a personal list of map and route bookmarks, no. The primary reason to create an OSM account is to contribute data to the map.

[0] https://wiki.gnome.org/Apps/Maps

[1] https://help.openstreetmap.org/questions/60673/display-names...