[automatic translation update] Updated 407 strings in 8 languages (ru, sr, uk, zh-cn, de, es, it, ko)

Migrate Goal plugin update script to use Migration Factory

Update SEO Metrics 

Tweak Overlay bubbles for better readability

Updating from 2.16 to 3.0.0b1 fails: piwik_site_setting doesn't exist

Improve look of glossary

Named parameters in generic proxy API events

Make sure to create a dropdown menu when there are more than 5 entries 

fix min and max event value is summed

When clicking on a related report, update report title and help

Fix integrity filecheck may falsely mark piwikjs as invalid

Adds login/logout events (3.x)

Format % values for plugin's metrics, cherry pick https://github.com/piwik/piwik/commit/d4d87dbfe90a4e6502dfc57ee6bfe61b67435b7c