ui-state inconsistent

• fix: when demoting a translator to viewer, the translator-buttons are hidden but an open language menu stays visible
• fix: when demoting a translator to viewer, the active target language stays active and blocks the entry in the listen-language menu
• general - not tested: make sure we cannot reach an undefined state by just using the ui

added Bug label

marked this issue as related to #99

mentioned in issue #99

marked this issue as related to #98 (closed)

mentioned in issue #98 (closed)

in general it should not be possible to get to an "undefinded state" just by using the UI in different ways. I would suggest consistency-checks when changing internal state (maybe use a finite-state-machine pattern?)

mentioned in issue #88 (closed)

mentioned in issue #86

marked this issue as a duplicate of #99

closed