Switching the sublanguage from EN (UK) to EN (US) for a defined group of terms

Question

During data migration to a new termbase, some 200 terms were accidently imported into UK English instead of US English. I can filter those entries. Is there any way to switch the sublanguage for all those entries from UK English to US English without manually copying them from one sublanguage to anbother? I already tried to export the entire termbase and import it into a new termbase not contining UK-English (setting: ignore sublanguages), but it did not work. 
 Many thanks in advance for your suggestions.

Paul · Answer

Hi Sönke Voß , 
 
I don't know how complex your termbase is, but if it's reasonably simple you might find dropping the termbase into the Glossary Converter from the SDL AppStore will help. You would convert to Excel with a drag and drop, correct the languages in there and drag and drop it back into the Glossary Converter to recreate your termbase.

Trados Studio > 3. MultiTerm

Switching the sublanguage from EN (UK) to EN (US) for a defined group of terms