Bug fixes:
* Fixed problem #541891 (file names with % in advanced file rename tool)
* Fixed problem #581645 (uncomfortable quick search)
* Fixed problem #596768 (build warnings for python)
* Fixed problem #596973 (documentation build error)
* Fixed problem #597144 (missing call to pclose)
* Fixed problem #597233 (validating of doc translations)
* Fixed problem #597890 (wrong arguments passed to meld)
* Fixed problem #598278 (memory leak)
