Whenever you create a new TextFrame using VBA in PowerPoint 2011, for some reason, the language defaults to English. In Windows, you could use the “LanguageID” property of the TextRange object to correct this, however Microsoft did not implement this property of the TextRange object in VBA for Mac.
The solution presented here uses AppleScript to change the language of all slides to Portuguese. Hope it is useful to someone!
tell application "Microsoft PowerPoint"
activate
set theView to view of document window 1
repeat with slideNumber from 1 to count of slides of active presentation
go to slide theView number slideNumber
tell slide slideNumber of active presentation
activate
tell shapes
select
end tell
end tell
tell application "System Events"
tell process "Microsoft PowerPoint"
tell menu bar 1
tell menu bar item "Tools"
tell menu "Tools"
click menu item 5
end tell
end tell
end tell
end tell
tell window 1 of process "Microsoft PowerPoint"
tell outline 1 of scroll area 1
select (first row whose value of static text 1 is "Portuguese (Portugal)")
end tell
click button "OK"
end tell
end tell
end repeat
end tell