Strange behavior with languages

Each day i upload via FTP new _lang files.

But they change automaticly to the oldones after 12 - 24 h....

Then i see only the keys, what can be the problem???

you need to follow the instructions in language pack..

I have said this in about three of your other language threads: You can not upload language files via FTP. You need to follow the installation instructions included with the pack's download. In the case of system language files, they must be imported from the Administration Panel. Dolphin creates the files under the /langs directory on-the-fly when it recompiles its languages (so any changes made to those files will be lost). To add new keys, use the Administration Panel.