i'm trying wps office now in zorin, it's good, but i can't find Arabic language dictionary spell check in it. i have searched a lot but i can't find it, have anyone tried to add unsupported language in wps, i mean using extension or third-party to enable that?
In WPS Office Installation in Different Languages it states WPS Office supports various kinds of languages, including English, French, German, Polish, Portuguese, Russian, and Spanish.... not Arabic, sorry.
You may try forcing a system wide application of Arabic...Arabic - Community Help Wiki
WPS support very few languages I'm afraid. My language are not supported either.