HSL is an abbreviation for "hue, saturation, lightness". I used the first letter of these words in the translation.

Regards Kris

PS: if you do not know what the translation is about, just have a look at the po file of an other language that you understand well. Also searching on wikipedia or google helped a lot for me.

Or the developers could add useful comments to the .pot file instead. Given some translators could not understand another languages different to its one and english my proposal is the best solution for all the translators.

Bye, Leandro Regueiro