Adding Customer-Specific Language
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Navigate to the > Administration > Overview > Look & Feel > UI Languages page.
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Click the button Add language in the Your Custom Languages area.
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Select a language.
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Choose Add.
The Add language dialog box opens:
Note: You can select right-to-left languages such as Arabic. However, the display in the system is not changed accordingly, but remains the same as for left-to-right language, for example English or German.
The language is added in the Your Custom Languages area. The language is not enabled, i.e. the users of the system still cannot select select the language as the interface language. The Note column indicates that no translated texts have yet been imported.

Define one of the standard languages as the source language for translation with a translation manager in your company. This does not require any action in the system. The fallback language is used when a text does not exist in the custom language. The fallback language is always one of the standard languages. Ideally, the fallback language is also a source language. Note Defining Fallback Language.