Thanks for the error report. I'll adjust the translation for the next release.
Regarding the duplicate fields: you're not the first one to report this, but I have really no idea what is causing the issue. I've changed the standard fields (title, artist, album, ...) to be configurable, so they become part of the user-defined fields at "Options > Tag Panel".
To achieve that, Mp3tag adds the standard fields if the previous version is before v2.88c (this is the development version were I've changed the Tag Panel). Once you open Mp3tag with, e.g., v2.89 the fields are added.
I have various ideas, but none of them can be confirmed by anyone affected. Let's try with you:
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You've updated to something >= v2.88c (e.g., v2.89) and used the same configuration with another installation < v2.88c. After that, the internal version setting was back to < v2.88c and once you've opened v2.89/v2.89a again, the standard fields got added again.
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The configuration file %APPDATA%\Mp3tag\mp3tag.cfg cannot be written, due to wrong permissions or other reasons.
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After the initial start of Mp3tag >= v2.88c (e.g., v2.89), it was not closed correctly and the settings were not saved (but the Tag Panel configuration was)
Let me know if you can shed some light into this. And for the saving problem: just remove the duplicate fields at "Options > Tag Panel". It's not meant to have duplicates.