Add feedback message when a segment is used, and browser_archiving_disabled_enforce = 1

[mattab]

• when browser_archiving_disabled_enforce = 1

• and when reports with a custom segment are viewed

• when the segment is set to "Real time processing" (this is a Custom segment feature) )

• then display a notification warning box with the message:

  You are requesting data for the Custom Segment "$name", the current Piwik configuration prevents the real time processing of this segment. Please ask your Piwik admin to change the setting in the config file (browser_archiving_disabled_enforce) or edit this Segment to be Processed by the cron archive.php script.

(message to be improved)

[tsteur]

In db7d1b5: refs #4569 display warning in case browser archiving is disabled

[tsteur]

Done, should work as expected. @matt you may want to have a look at the translations as it says "Message to be improved".

[mattab]

In 975d2ce: Refs #4569 Tweak to message + display as raw for segment names with entities to display ok

[mattab]

In 47d062b: Fix regression in code Refs #4569

[mattab]

In 961d25e: refs #4569 Make message user focus, with extra help for Super users