Description of severity levels:

0Translate is up-to-date
1Parent language has changed a little. Your translation might need updating.
2Parent language has changed. Your translation probably needs updating.
3New text was added in parent language which you haven't yet translated.
4Item code in use but no text exists yet for any language.

Searching

When searching, you can search for a certain severity level (0, 1, 2, 3, 4) or search for everything at or above a certain severity level (0+, 1+, 2+, 3+).