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 Job ID Name Coverage
  Test
passed #22647
testbuild

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failed #22643
testbuild

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  Builddeploy
passed #22645
deploy-release

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passed #22646
deploy-softwaresite

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passed #22644
deploy-updatesite

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