Please describe the problem:
If the 'Write metadata to files' is checked, the album tag in the tracks with an empty tag is written with the localized version of 'Unkonwn Album'.

Steps to reproduce:
1. Check the option 'Write metadata to files' in Preferences.
2. Choose any track, clear its Album tag and save.



Actual results:
The Album tag of the track contains the string 'Unknown Album'.

Expected results:
The Album tag should be an empty string.

Does this happen every time?
Yes.

Other information:
Of course, I can uncheck the option to edit albums and check it again the edit other tags. A little bit annoying I think.