Merge branch 'redeWiedergabe_dev' into 'master'

deleted old metadata_names; fixed speaker bug

See merge request !82
5 jobs for master in 55 minutes and 11 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed testbuild #22647

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failed testbuild #22643

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  Builddeploy
passed deploy-release #22645

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passed deploy-softwaresite #22646

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passed deploy-updatesite #22644

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