Mathcad keeps changing spell-check langugage by its own

My mathcad 7 prime keeps changing spellcheck language by its own. It is set to danish by default (also in my template) but everytime i put a text box in and write just one letter it changes to english?? also in my older previous documents this also happens and when i write in a textbox that IS changed to danish it corrects to english again and says "mixed languages" what to do???