You have
(Front Compound)(Rear Compound) (first adjective)(second adjective)(the{*2})(hyphen{opt})({*2}x{opt[see 'the]}) (of x)
So, 1st word is always 1-2 compound word regarding the subject, and is verbs for planning or already done (that I can tell). The 2nd word is 1-4 compound that is followed by the, and is usually nouns and adjectives. The 3rd word is of and then usually a plural noun or a acting verb.
As such, andux's translation was wrong.
It's "Language the un-decency of speaking."
Because of sentence structure, this is translated into english more like
"Undecent is the language to speak with."
But I'm poor at languages, so I can't tell. I also have been freely violating this in giving people words too, because...
... It just isn't developed enough to make a real language we could converse with one another over.
I can think of a way it could be, but it requires a dedicated language group, submitting words to toady and getting them approved.
It applies to all of Toadyone's languages too, not just dorf.
(Edit: Fresh Prince of Bel-Air opening line. Read it, guess what it means, then look at the spoiler. See how well you do!
Tellwords the strange un-stance of princes
--->
Telling the strange tale of princes who aren't standing right
bel-air the discovery of home
--->
making the discovery that bel-air is home.
Now this is a story all about how my life got flipped-turned upside down I liked to take a minute just sit right there and tell you how I became the prince of a town called Bel-Air
--->
Telling the strange tale of princes who aren't standing right making the discovery that bel-air is the home.