PoChecker: refactor.
- Drop the listbox for translated po-files
- Now possible to test multiple master po-files
- Language filter controls setting of "Find All Translated PoFiles"
- Regenerated language files.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46475 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: designer: clean up undo code

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46476 4005530d-fff6-0310-9dd1-cebe43e6787f