Resolve "URL "lesson" does not exist and thus can't be resolved"

Closes #144 (closed)

added part::backend prio::1 type::bug workflow::confirmed labels

assigned to @nik and unassigned @hansegucker

marked this merge request as ready

added 1 commit

• 41d8d60d - Replace lesson by lesson_period in menus

Compare with previous version

added 3 commits

• 41d8d60d...3b1656df - 2 commits from branch master
• 8b7a8ff0 - Merge branch 'master' into 144-url-lesson-does-not-exist-an-thus-can-t-be-resolved

Compare with previous version

mentioned in commit 8fa4593c

merged