You're right - there is a lot of teeny little details to keep straight! The google translator says that enifache nadel means "simple needle," so I would guess that means they're ordinary. (sharps)
A sharp won't usually say it's a sharp on the package - but it also won't say Ball Point or Universal. It may say "For Wovens" or something like that.
The "universal" needle is universally a pain in the neck - it works fine in some machines in some situations, but generally, it doesn't sew wovens as well as sharps and it doesn't sew knits as well as ball points.
Check your manual to be sure of the class of needle that you need. Most home sewing machines take a standard 15x1 needle system. They're also known as HAx1, 130 or 705 or 2020 - and other numbers depending upon who makes them.
Most stores don't sell many needles that aren't for this system, but you may find some serger needles - DBx1, BLx4, etc. Be careful that you're not shopping in the serger needles. :)
I like Organ brand - very good quality and low cost - I buy them by the hundred on eBay for about $15 - or here:
http://www.ctsusa.com/product.aspx?pf_id=21HOME .
Schmetz and Klasse' needles are also very good quality, but they're a lot more expensive. The advantage to Schmetz is that they make tons of different kinds of 15 x 1 class needles - embroidery, topstitching, quilting, metallic, twin, wing, denim, etc.