Fix typo in "Schleswig-Holstein".
Extract generic function "openDropdown".
Set margin for buttons instead for "my-entries-link".

+ Decrease margin from 20px to 12px.
Fix offset for menu items group of dropdown buttons.
Remove unused map view template.
Add regions dropdown button to map.

+ Regions are listed in alphabetical order.
Set select field option when router initializes map area.
Dynamically initialize area select element.