Fixed #189 - update screenshots

build/screenshots/bearbeiten.png

build/screenshots/bericht_1.png

build/screenshots/bericht_2.png

build/screenshots/buchungen.png

build/screenshots/de/bearbeiten.png

build/screenshots/de/bericht_1.png

build/screenshots/de/bericht_2.jpg

build/screenshots/de/buchungen.png

build/screenshots/de/diagramme_1.png

build/screenshots/de/diagramme_2.png

build/screenshots/de/diagramme_3.png

build/screenshots/de/einstellungen.png

build/screenshots/de/filter.png

build/screenshots/de/kategorien.png

build/screenshots/de/normal.png

build/screenshots/de/overbudget.png

build/screenshots/de/suche.png

build/screenshots/diagramme_1.png

build/screenshots/diagramme_2.png

build/screenshots/diagramme_3.png