Resolve "Better error message if there are no matching lesson periods"

Closes #86 (closed)

changed milestone to %1.0a1

added part::frontend part::i18n prio::2 source::customer labels

added 1 commit

• 675153b2 - Make error message if no lessons are available more clear

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unmarked as a Work In Progress

assigned to @nik

mentioned in commit 4a5b813e

merged