Issue #3134349 by sleitner, yookoala, sharma.amitt16, Akram Khan, penyaskito,...

Issue #3134349 by sleitner, yookoala, sharma.amitt16, Akram Khan, penyaskito, sahil.goyal, swatichouhan012, s_leu, larowlan, smustgrave, joachim: \Drupal\language\LanguageNegotiator does not handle PluginNotFoundException and break the site completely

(cherry picked from commit 67fc8fbf)