Defining Fallback Language
Define the so-called fallback language. The fallback language is used when a text does not exist in the customer-specific language. The fallback language is always one of the default languages and, ideally, also a source language. The preset is the default language English (United States).

You have added at least one customer-specific language. For more information, see Adding Customer-Specific Language.
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Navigate to the > Administration > Overview > Look & Feel > UI Languages page.
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Click the Customize button in the Your Custom Languages area for the language for which you want to define the fallback language.
The Your language dialog box opens:
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If the default fallback language of English (United States) does not match, click Change fallback language ❶.
The Select fallback language dialog box opens.
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Select a different default language as the fallback language from the drop-down list.
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Click OK.
The Your language dialog box opens again.
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Click the ✕ in the upper right corner.
The dialog box closes.
You have changed the fallback language.

In the next step, download the source language. For more information, see Downloading the Source Language.