I came across a problem where the copyright pop up message during logon is appearing as English with logon in Chinese language.
After investing lot of time, found below way to translate those texts.
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These entries are stored in Cluster Table "DOKTL". Based on the contents identify the documentation object from table "DOKTL".
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Documentation object in this case is "COPYRIGHT_ORACLE". Now to translate these entries go to transaction SE63.
Go to ABAP Objects --> Long texts (Documentation) --> C6 F1 Help --> TX General Texts
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Enter object name as below.
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Translate the text as shown below --> Save --> Activate.
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Now Login with ZH language, you will find the pop up message as translated above.