Updating UI submodule for new Installation test [fixes #6685].
2.9.1-b2
Fix event documentation
Fixes #6692 Remove one admin screen and link to Marketplace directly, show Upload ZIP feature in Marketplace page. The deleted English strings were removed from otrance our translation platform.
Refs #6685, updating screenshot tests in https://github.com/piwik/piwik-ui-tests/commit/15a557ac3073d8730d5f56cee821c29a37242df6 .
test do not fail when english string is deleted and translation not yet deleted
fixes #6694 show all websites in scheduled reports (all of them)
Mark test as skipped instead of failed when the language files are not synchronised cc @sgiehl
Fixes  #6695 show git:pull command whenever piwik is deployed from git (push and commit commands are still shown in development mode only)
Only show git:commit and git:push command when development mode is on and Git repository is found refs  #6695
Fix unit test after I disabled some tests in 13c730f35381b441b1b02b22e3990f3f5148de59 cc @sgiehl
Fixes  #6696 Prevent this mysql error from occuring during updates - @tsteur will ask user for more info in case there really is a bug
2.9.1
Marking developer changelog as 2.9.1
Add note about new console command core:plugin list
permission fix
Merge branch 'master' of https://github.com/piwik/piwik into time-bugfix