Just a fast map.
I think the germanic cultures of Europe can be divided in 3 big cultural groups. At first, don´t forget that there is a difference between germanic and german. Germanics are all nordic people of germanic ancestry. Germans are the germanic people in central Europe, and call themselves Deutsche. The english language never used the new name, but kept the old one.
1. Continental Germanics: Germans, Dutch, Flemish, Austrians, Liechtensteiner, Luxemburger, German-Swiss.
In the 19th century many patriots defined all continental Germanics as Germans, the world wars
destroyed this dream and the dutch, part of the Reich until 1648, do not feel as Germans anymore.
2. Island Germanics: During the peoples migration time, the Anglo-Saxons from Northgermany and Denmark moved to the british isles, they built the basis of the english ethnic. Later also danish and other scandinavian vikings settled in Britain and also in Ireland.
There are of course still rather celtic regions like Wales, Cornwall, Northwest Scotland and Northwest Ireland, but even they´re mixed and part of a germanic nation and culture.
3. Scandinavians: The northern kind of Germanics from Norway, Sweden, Denmark, Iceland, the minorities in Finland and smaller isles like the Färöer Isles.
The symbol in the background is the Valknut, which could be a perfect symbol for the three Germanics:en.wikipedia.org/wiki/Valknut
The runes are saying in German: Alle Germanen vereint = All Germanics united