Understanding Review Queue
When I see the status it shows "100% translated, 0% reviewed". At another translation platform (transifex) there may be two different roles for translator and reviewer. I read the documentation and could not find if translatewiki also has two different roles for translator and reviewer.
As regards commit, overall translation level is still below min expected percentage (MantisBT page says 40%) in main project, so I'll continue to translate and verify the results once I achieve that level.
There is only one role here, which allows both to review and translate. You cannot review your own translations though, only translations from others.
There is currently no review threshold for exports, the threshold only checks translation completion percentage.