The Lyrics (All) edit panel is used to access all lyrics found in the currently selected files. The Lyrics edit panel is used to display the default lyrics for the current file selection. For compatibility with Apple applications the default lyrics are those present in the last lyric item in an audio file.
A lyric has two fields other than the actual text field. The first is the Description field which is a short description used to differentiate multiple lyrics in the same file. This field is intended to be unique amongst all the lyrics in a single file. The second field is a three character language code which describes the language of the lyrics. The field will display the default language code you set in Settings-Audio-ID3 Specific. You can leave the field empty to use your default.
All editing and manipulation is done via the context menu and is described here.