SPX user interface can be translated to any language.
All languages are json-files containing user interface strings. These locale -files are stored in <SPXROOT>/locales -folder. SPX comes with several language files but we would be grateful if you would like to contribute and create a locale file in your language!
You can create a copy of the original Google Sheets language document, add a column for your language, fill in the fields and you can submit that back to us.
Read detailed instructions from the Google Sheet SPX locales document.