Hi Patrick,
I installed the language pack (Portuguese) and check the workflow actions in designer with the site collection created in Portuguese, however the actions were same as the English site collections.
I recommend to clear SharePoint Designer cache and then check if the issue still occurs.
http://www.c-sharpcorner.com/UploadFile/sagarp/how-to-clear-your-sharepoint-designer-20102013-cache/
By the way, did you run SharePoint product configuration wizard after installing the language pack?
If not, please run it and then check how it works.
Thanks,
Victoria
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