spells_en is no longer used.
It stands for spells_english, Im sure out there somewhere is a spells_fr, spells_sp, etc. They are not only the effects of the spells 'but most of that is really server coding actually', but also the text of the spell when you cast, have it cast on you, it wears off, etc. So there should be a different version for each language the game is produced in, I believe.
Not sure when they swapped around on the spell lists, but spells_us has been the only one updated for a long time now, and seems to be the only one being called to by the client for data. I 'believe' that spells_en is the origional series of spell files that came with the game, and spells_us was created when they went global with it. But my opinion and $1 will equal $0.99, if you catch my drift.
edit: for a doh doh doh! on my part
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