CrossOver has been and is being translated into many languages. This means it is possible to have it display in another language depending on the MacOS settings.
If CrossOver is displaying a language you would not expect, close CrossOver and verify your settings:
Go to System Preferences
Under 'Personal' select 'International'
Verify that the language you would expect is listed first
If not, click and hold the language you would expect and drag it to a higher priority
Close the 'International' window
Launch CrossOver and verify your changes were made.
Please note that CrossOver respects the "English" setting but not "British English", "American English", etc. "English" must be the top-most system language, or the secondary language beneath a specific type of English, in order to CrossOver to display in English.
Next Step: Why is my Date Format wrong?
Why is my Date Format wrong?
Set a Windows application to use a different language than the OS
Type non-English keyboard characters in Windows applications
Set CrossOver to use a different language than the OS