In the backoffice you can define what languages you support as well as the default language of your application / factory.
Includes pre-made customizable widgets to select the languages defined:
Note: Leverages on Countries component to present a complete list of languages, countries and flags. This component takes advantage of the new Multilingual Reactive Web and Mobile Apps which is currently on Technical Preview. Make sure you have the minimum Platform Version and LifeTime version required and this feature enabled to avoid unexpected errors when installing.
Before when selecting the language, the display name of that language would come from the Countries component (for example, the display name for "Dutch, Flemish") and now this can be overridden on the locale configuration (following the previous example, it can now be set to "Dutch").