The dominant allele is expressed and the recessive allele is masked. This is an example of complete dominance. In heterozygous relationships where neither allele is dominant but both are completely expressed, the alleles are considered to be co-dominant. Co-dominance is exemplified in AB blood type inheritance.
swale (plural swales) 1  A low tract of moist or marshy land. 2  A long narrow and shallow trough between ridges on a beach, running parallel to the coastline. 3  A shallow troughlike depression that's created to carry water during rainstorms or snow melts; a drainage ditch.
The English word Firebrand is a Bahuvrihi compound though, meaning that the meaning of the word is not dependent on the meaning of its constituents. Firebrand literally means a person who causes political or social trouble by opposing authority and encouraging others to do so (Cambridge Dictionary), so 'Aufwiegler' is a very fitting translation even though, granted, not the most aesthetically pleasing.