The designer interface can be localized by pointing its options at Stimulsoft language XML files.

Set the localization and optional extras.
designer = StiDesigner()

designer.options.localization = 'de.xml'

# Optional extra localizations shown in the designer's language menu
designer.options.localizations.append('es.xml')
designer.options.localizations.append('pt.xml')

How it works. The designer loads its captions from the chosen XML, so switching interface language is a single option.

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