new script and level urls

Rename the non-custom scripts so we have better urls:
`/s/flappy/`
instead of
`/s/Flappy%20Levels/`

One disadvantage is that we were using the name as a key in loc, so we will have to relocalize them. The only publicly accessible script that is affected is Flappy.

left /hoc and /s/1/ with the same names because we are not changing the url behavior. (and so we don't have to relocalize those).