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 have to enable the Grouping by locale for e-mail option in ARIS Connect. See Customize infrastructure of the ARIS Connect online help (Manage ARIS Connect > Configure ARIS Connect > Set up Process Governance > Customize infrastructure) and What infrastructure properties are available? of the ARIS Connect online help (Manage ARIS Connect > Configure ARIS Connect > Set up Process Governance > Valuable information > What infrastructure properties are available?).