Currently, this skill reads “Increases your ice property resistance and the defense of your shield corresponding the magic defense. The corresponding value applies to 25% per attribute level.”
It, however, should read, “Increases your Ice Resistance, and Magic Defense, by 25%, per level, of your Shield’s Defense.”
Or something similar…
“Adds Ice Resistance and Magic Defense equal to 25% of your equipped shield’s Defence per attribute level.”
Would be how I would phrase it. I think your suggestion has a bit too many commas. 
Hi there,
I have changed the description. Thanks for reporting.
If you find any more translations, please submit them on the forums. I am going to ask IMC to open up the Translation Bug Report forums, so everything can be more neatly organized.