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.
Sort area select options alphabetically.
Add default bounding box (Germany).
Apply default bounding box to map.
Fix alphabetical order ... Bayern is not on pole position here :}
Avoid generic variable name.
Merge branch 'feature/enable-regions-menu-249'