Are there any limits to what spells spellcraft can identify?

[ElyasRavenwood]

Is spell craft language dependent?

Are the verbal components of spells spoken in a language, or is there a "magical language?"

For example A Taldan wizard who speaks Taldan but not Qadiran and a Qadiran wizard who speaks Keleshite (Language of Qadira) but not Taldan.....take a dislike to each other and both cast magic missile spells at each other.

Now both wizards can use their spell craft skills to identify the spell the other wizard is casting.

Is there a "magical language" that spells are spoken in that allow both casters who do not share a common language to identify what each other is casting?

How about another situation:

Some explorers manage to stumble on a serpent fold vault deep underground. they open the "stasis chamber" that the serpent folk has been hibernating in.

In a fit of anger the serpent folk casts Spell Steal. Spell steal is a 5th level arcane racial spell from the Monster Codex. Presumably this was a spell that the Serpent folk didn't share with others, and required a serpent folk caster of at least 9th level to cast this spell. This would make the character most likely 13 hid. This particular serpent folk has been stuck in a stasis pod for most likely over 10,000 years.

Would Spell craft be able to identify spell steal as it is being cast?

Would Spell craft be able to identify a spell that a sorcerer has developed himself and he has not shared with everyone else?

thank you

[Rub-Eta]

As writen, you only need to clearly see the spell being cast. Nothing about hearing.

There's no "magical language" and spells and magical writings such as scrolls are not language dependent. You can attempt spellcraft checks no matter what language a caster speaks or writes.

The Serpent Folk situation: If the Spell Steal spell/spell-like ability is unique to them and has been kept secret for 10,000 years, there's no way to identify it by a simple spellcraft check.
If there's the slightest knowledge about it (or a similar spell known by the world today), there should be a chance to find the casting to be similar.