Minor user message fixes: Spelling fix, Capitalization fix.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22963 57a11ea4-9604-0410-9ed3-97b8803252fd
Update German translation a bit.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22964 57a11ea4-9604-0410-9ed3-97b8803252fd