Endless OS is available in multiple editions, which feature a varying collection of preinstalled software and content originating from many different sources. The collection of installed software/content can be further customised for specific Endless OS deployments, and through the user adding or removing software/content from their installation.
As such, the question of "Which languages are supported by Endless OS?" does not have a simple answer.
Endless authors and maintains the following applications and content in the primary supported languages:
Endless OS Full version images are available targetting regions where these languages are spoken. These images include a significant amount of software/content specifically available in those languages. For example, the Spanish image includes an encyclopedia where all of the article content is in Spanish.
Endless OS's user interface is based on the GNOME desktop environment, which is developed by a community of third party developers with contributions from Endless. As a well established desktop computing platform, translations are available to varying degrees into many different languages. Naturally, the most common languages feature the most complete translations. Please refer to the GNOME L10N tracker for more details.
Endless OS ships the full collection of translations included in every GNOME release. You can adjust your language in Settings to select any available language translation. This can be done on any Endless OS installation regardless of which image was used, for example, if you installed with the Spanish image it is possible to select the Arabic translations.
Endless OS is also bundled with third-party freely redistributable apps. These apps are hosted on Flathub, where over 1,000 apps are available. The language support of such third party apps varies largely. The most popular and well-established applications, such as the LibreOffice office suite, offer complete translations into many common languages.
For pre-installed apps, the pre-installed translations depend on the Endless OS installation image. The Basic and English image includes the following translations (where available):
The Spanish, French and Portuguese images include only those languages, respectively.
If you change your language to a language not listed above, updates to your preinstalled apps will appear in the App Center, and these updates will install the translations to your newly selected language.
For any apps you install after having set up your Endless installation, translations for the language(s) you are running on your system will be automatically downloaded at app installation time, where available.