The first one is definitely backwards (perhaps it's as Hayley says, or it's the reverse side of some very thin paper - I have an air-mail letter with similar effects).
Load it to IrfanView (or a similar program) and do a "horizontal flip". It's still hard to read, but some of it comes out clearly. For instance, near the bottom, you can see it was written in Cologne "Köln, den 11. Oktober 1921" (Cologne, 11th. October 1921).
No time at the moment for a full translation, but it seems to be some kind of ruling about whether someone was married (intended to marry ?) or whether they were living in sin ("Sünde der Konkubinate" - sin of concubinage) . It's to do with catholics so there are latin words and phrases sprinkled in it.
Bob