String fields have to be enabled to support multiple languages. Then the required languages can be added to the field.
Preparing
On the Languages tab of the field’s properties you can add languages after you have enabled the field for multiple languages. For each added language an additional subfield is created that has its own properties and can hold its own text content (value).
NOTE: String Fields & Language Specific Sorting String Fields can have a language specific sorting index. For more details, see “Overview: Field Properties” section “Indexing”. (For fields without multiple language support see no. 12 in the overview and for fields with multiple language support no. 18).
