Merge branch '110-show-also-groups-with-child-groups-with-lessons-in-my-groups' into 'master'

Resolve "Show also groups with child groups with lessons in my groups"

Closes #110

See merge request !93
3 jobs for master in 2 minutes and 54 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #12186
lint

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passed #12185
test

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  Build
passed #12187
build_dist

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