Minor corrections in chapters 1-130

[DarjaAppelganz]

[x] Chapter 26: last paragraph is missing
[x] Chapter 39: Exp 12
[x] Chapter 64: Exp 13
[x] Chapter 68: last bracket in the chapter is missing (see the last sentence)
[x] Chapter 72: last sentence is missing
[x] Chapter 109: all examples must be aligned
[x] Chapter 114: all examples must be aligned
[ ] Chapter 115: Exp 1
[ ] Chapter 117: Exp 15
[ ] Chapter 125: Exp 1
[ ] Chapter 127: Abstand in den Bsp
[] Chapter 128: Abstand in den Bsp
[] Chapter 129: ll examples must be aligned