[TYPO3-translators] ll-xml Tool don't find translation files

[Valter]

Hello,

My TYPO3 installation does not locate ONLY SOME of the translation files.
Neither in frontend displays the correct language in some exts nor in 
the backend ll-xml tool displays the translated file, as it's not exists.

For example, llxml does not find the file 
typo3conf/l10n/gr/tt_news/pi/gr.locallang.xml although it exists and 
diplays :

External filename:	typo3conf/l10n/gr/tt_news/pi/gr.locallang.xml
Translations will be local in main file (0 already)! [No thanks, move to 
external file!]

Note: I've checked file rights, file encodings, and deleted 
typo3temp/llxml folder

Any Ideas?

Thank you