Aurel isn't the most adept at sensing, but perhaps taking a moment to listen to his Intuition couldn't hurt?
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Aurel remains in a middle area of the group, the best to allow his glowrod to illuminate everything around them that the lightsabers could not reveal. His free hand stayed at the ready, prepared to draw his own at a moment's notice.
Jelena is certainly the expert here... and moreover, expert enough to know that a single 'Sith tongue' is a vague concept to apply to all of history, and also that any language related to the Sith would likely have been kept to the Sith, and hence was useless for general use in the galaxy as no-one would have understood it.
In fact, only one symbol here is decisively Sith in nature- the emblem of Darth Kazan at the bottom. The rest is an old outer rim variant once widely spoken on the fringes, which the Sith invaders brought with them at this time.
It basically reads that unauthorised personnel going any further won't live long. That'll; be because this is Darth Kazan's Central Command Bunker.
"Wouldn't you know..." Vera-Kin says. "I guess we're not going to live very much longer."
Vera-Kin is going to press on, certainly still on edge and wary of their surroundings, more so now that she knows what this place is. She wants to find out what Adelmo found, and wants to figure out what the source of danger is.
You can certainly imagine that Intrusion will be of help in here at some point, but it's still just an empty corridor thus far.
However, your intellectual sides are less sure about the fear. This place is dead. The war was over thousands of years ago. There's no Kazan-zombie in there to destroy all-comers, though that would be pretty cool.