Just call setLanguageyour content. A quick n-dirty script to execute this would be something like:
cat = context.portal_catalog
for brain in cat.unrestrictedSearchResults(Language='en-ca'):
content = brain.getObject()
content.setLanguage('en')
content.reindexObject(idxs=['Language'])
You will need to re-index your content after changing the language parameter, but the parameter idxsfor the call reindexObjectensures that only the language index is updated, which will speed up the process.
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