Hamburger Menu should be tab-able

Hamburger Menu (and contents) can currently not be reached via tab/keyboard, as far as I can see.

Related #439 (closed), first point.

Should be fixed.

added Accessibility label

assigned to @hueser93

@hueser93 ich war mal so frech, Dich zu assignen, bin nicht ganz sicher ob das passt... Könntest Du bitte mal gucken (lassen), wie man das mit dem tabbable Hamburger Menu hinbekommt? Danke!

/cc @frust45

mentioned in issue #439 (closed)

marked this issue as related to #439 (closed)

assigned to @frust45 and unassigned @hueser93

created branch 440-hamburger-menu-should-be-tab-able to address this issue

mentioned in merge request !725 (merged)

mentioned in commit f164732d

closed with merge request !725 (merged)