Garmin Connect Web and Mobile in pt-BR (Brazilian Portuguese) with incorrect training name "Natação em piscina"

Maybe add where it is exactly. I looked at public activities on your profile and titles and types of activities look ok.

Here is the file with translations: activity_types_pt_BR.properties and with correct encoding it looks ok, but with wrong encoding you can get incorrect chars, but then there should be problem with more texts, not just this one. If you have strange chars elsewhere too, then try changing encoding in your web-browser.