Some releases have no linguistic content in the tracklist (e.g. just numbers or symbols), but we currently don't display the correct language option in the release editor.

To resolve this task, the frequency of the row with iso_code_3t='zxx' in the language table needs to be changed from 0 to 1.

Some examples are tagged as http://musicbrainz.org/tag/missing%20language%20code-zxx