As a candidate with a german degree you have to certificate spanish or portuguese language knowledge at a minimum level of B2 GER. The certificate needs to explicitly confirm that you have that level. The certificate needs to be submitted with the application and can´t be given in later.
As a candidate with a foreign degree the university entrance qualification might as well count as the certification of your portuguese or spanish knowledge, if it was completed in a spanish or portuguese speaking university. Additionally, you have to certify your german knowledge. At the moment of the application it is enough to submit a certificate of the B2 GER level. For an unlimited matriculation in the Master`s program, a DSH2 level or an equivalent (+/- C2 GER) has to be certificated. Applications with a certification of level B2 can be accepted under the condition that before the beginning of the studies at the FU Master`s program, a DSH-exams has to be made and be passed with a minimum level of DSH1. All those accepted candidates will receive an invitation for that exam. If the exam gets passed only with DSH1 and not DSH2, the candidates will have to visit a German course during the first semester and repeat the DSH-exam at the end of the semester, having to pass that one with DSH2. With that level the candidate receives an unlimited matriculation. Here you can find information on the DSH exam.