Processed metrics metadata 

OK. Only saw it while having a quick look and thought to share it here. Later it "has to be done" to make the API method work that returns all existing translations https://github.com/piwik/piwik/blob/processed_metrics_metadata/plugins/API/API.php#L92-92 anyway so would be nice to get rid of this if/else and improve speed. There are currently some metric translations hard coded and some added via event... (can be refactored in next step) . I guess if someone wants to change a default metric one would currently have to create a new metric class that overwrites the default metric translation?