Icon for breaks is not helpful

Suggestion: Vertical hourglass instead of horizontal

added part::frontend source::customer::kath labels

changed milestone to /AlekSIS%"[NLnet #1 (closed)] Fix existing bugs with new timetable"

created branch 8-icon-for-breaks-is-not-helpful to address this issue

mentioned in merge request !40 (merged)

mentioned in commit 988a8bab

closed with merge request !40 (merged)