Specify a correct template

What causes this issue?

Templates that are entered during the language adjustment must always
have the form
LL< ... >
You tried to enter a template that does not satisfy these requirements.
Note that a template must have at least five characters.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.