If you're using a theme that supports multiple language interface for your newsroom, you can specify which interface language to use for your newsroom in Settings > General > Publication Language by entering the language code.

Here's a list of the supported languages for each theme and the corresponding language codes:

ThemeLanguage CodeLanguages
CASPERenEnglish
RUBYenEnglish
ALTOenEnglish
DAWNenEnglish
LIEBLINGarArabic
LIEBLINGbgBulgarian
LIEBLINGdeGerman
LIEBLINGenEnglish
LIEBLINGesSpanish
LIEBLINGfaPersian
LIEBLINGfrFrench
LIEBLINGheHebrew
LIEBLINGidIndonesian
LIEBLINGitItalian
LIEBLINGkyKirghiz, Kyrgyz
LIEBLINGltLithuanian
LIEBLINGnlDutch
LIEBLINGplPolish
LIEBLINGpt-brPortuguese (Brazil)
LIEBLINGroRomanian, Moldavian, Moldovan
LIEBLINGruRussian
LIEBLINGtrTurkish
LIEBLINGviVietnamese
LIEBLINGzh-hansChinese Simplified
LIEBLINGzh-hantChinese Traditional

Example:

If you're using the LIEBLING theme and want to set the newsroom interface language to French, you should enter fr in Settings > General > Publication Language.

Note:

This feature has nothing to do with the Multi-language feature that allows you to create multi-language newsrooms.