Mautic is used by a world-wide community and therefore it can be localized to any language. If you cannot find your language yet, take a look to the section about how to translate Mautic.
Language can be selected in 2 places.
In the Mautic configuration the default language can be configured. It is pre-set to
English - United States by default. Every user will see this language if she doesn't configure her language in her profile.
A user can define her own language and override the default language. This lets a multilangual team work on the same Mautic instance.
Mautic can be translated to any language. As Mautic is a community project, it can be translated by any community member to any language. Translations are made in the Transifex web app.
Take a look at official Transifex Documentationif you have any questions about the translation process.
A language is downloaded automatically every time the configuration is saved and the language hasn't been downloaded already. The tricky part is that Mautic won't download a language if it has been already downloaded. So to update a language:
The language should be downloaded again with the latest translations. The translations are generated from Transifex once a day.
If you have any questions about translations, join the community in the Slack #Translations channel.