Add data for `FO3 Error Fixes.esp`.

http://www.nexusmods.com/fallout3/mods/16490
Update `&AlreadyInUF3P` per skyrim's masterlist.

"Upgrades" the message type from `say` to `error`, uses `content` that's
translated to Russian and Spanish, and checks whether the UF3P actually
is active instead of just whether it exists.