Dictionary - OFF?

Can anybody tell me how tu turn off english dictionary.

I work in polish and Storyline non only mark word's on red when they are not proper in english....
Storyline changes some of my polish words automaticly!!!!

Let say I have in polish word "ta" (means SHE). Storyline changes this word to "at" (in polish means... developer is drunk).
I try add my word to dictionary, ignore it - still automaticly changes.... crazy :(

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