Locking files for one language in an lpu file containing multiple languages

I have an .lpu file containing three languages. One if the languages, eg Italian, does not need all files translated. Is there a recommended way to lock the strings for Italian?
Currently I am selecting those files in Italian, setting the English strings to "Validated" so they don't appear in word count statistics, then "set locked". I can see this possibly causing problems later where an English string is leveraged in as Italian. Is there a correct procedure?