Constants of Localized string type can be maintained in multiple languages. During execution time of the automated process, the text contained in the constant is displayed in the preferred language of a user. You can specify a default language. This language is used, if, for example, a language is not specified, or a value is missing.
You must enable the Grouping by locale for e-mail option in ARIS. See Customize infrastructure of the ARIS online help (Manage ARIS > Configure ARIS > Set up Process Governance > Customize infrastructure) and What infrastructure properties are available? of the ARIS online help (Manage ARIS > Configure ARIS > Set up Process Governance > Valuable information > What infrastructure properties are available?).