Please follow the steps below :
Step one : Open your Adobe Application Manager
Step two: Click on your name- This should open a small drop down menu ( I know its not very obvious so here is a screen shot)
Step 3: Click on preferences
You will go directly to languages.. select the language you want.
If you have already downloaded the app, just restart it - go to preferences or help ( in case of Edge animate for example) and change language.
Now, why did this happen in the first place? My best guess is your default PC language or Keyboard language settings is to blame.