This file is indexed.

/usr/share/kde4/config/accept-languages.codes is in kdelibs5-data 4:4.13.3-0ubuntu0.5.

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The actual contents of the file can be viewed below.

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[ReplacementCodes]
nb=nb,no
nn=nn,no
sr@latin=sr-Latn,sr
sr=sr-Cyrl,sr
pt_BR=pt-BR,pt