Merge pull request #30 from qiujiejun/master

support opening *.zip file.
add Polish
Merge pull request #31 from onyx-cap/master

Add Polish translation.
fixed the crash problem in FBReader search; fixed compilation error of the strings resources.
Merge pull request #32 from onyx-cap/master

fixed the crash problem in FBReader search; fixed compilation error of the strings resources.