LCL: improved translations handling, bug 26616:
  - fixed typo, which lead to PreviousMsg corruption/"accumulation"
  - improved line ending handling consistency (now treating #10#13 like single line ending, not like two ones)

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46076 4005530d-fff6-0310-9dd1-cebe43e6787f