Correct field format in python-import-fields.
German translation of Transactions chapter.

(cherry picked from commit dcbd509705f270e0ab4d446cc06a1f0fa58cba38)
Updated documentation to explain how to tie dividends received in cash to the appropriate stock holding.
Reduced size of image to 510px to match the image being replaced as requested by John Ralls.
Reduced proportional width of description column to increase overall font size for a 510 pixel width image.
Merge branch 'maint'

- How to tie dividends received in cash to the appropriate stock holding (Daniel Dodson)
- German translation of the Transactions chapter (Martin Mainka)
-  Correct field format in python-import-fields (Mike Evans)