Update main/res/values-pl/strings.xml
Update main/res/values-pl/strings.xml

Polish translation finished. I was comparing with current version of English string.xml.
rsudev/c-geo-opensource,xiaoyanit/cgeo,superspindel/cgeo,brok85/cgeo,yummy222/cgeo,samueltardieu/cgeo,tobiasge/cgeo,lewurm/cgeo,superspindel/cgeo,Bananeweizen/cgeo,kumy/cgeo,cgeo/cgeo,mucek4/cgeo,kumy/cgeo,cgeo/cgeo,SammysHP/cgeo,mucek4/cgeo,madankb/cgeo,xiaoyanit/cgeo,rsudev/c-geo-opensource,ThibaultR/cgeo,vishwakulkarni/cgeo,tobiasge/cgeo,Bananeweizen/cgeo,superspindel/cgeo,S-Bartfast/cgeo,schwabe/cgeo,matej116/cgeo,marco-dev/c-geo-opensource,rsudev/c-geo-opensource,yummy222/cgeo,cgeo/cgeo,KublaikhanGeek/cgeo,SammysHP/cgeo,brok85/cgeo,madankb/cgeo,auricgoldfinger/cgeo,ThibaultR/cgeo,mucek4/cgeo,lewurm/cgeo,xiaoyanit/cgeo,KublaikhanGeek/cgeo,schwabe/cgeo,matej116/cgeo,kumy/cgeo,Huertix/cgeo,ThibaultR/cgeo,matej116/cgeo,samueltardieu/cgeo,samueltardieu/cgeo,schwabe/cgeo,vishwakulkarni/cgeo,Huertix/cgeo,lewurm/cgeo,schwabe/cgeo,auricgoldfinger/cgeo,marco-dev/c-geo-opensource,Huertix/cgeo,KublaikhanGeek/cgeo,brok85/cgeo,yummy222/cgeo,S-Bartfast/cgeo,pstorch/cgeo,S-Bartfast/cgeo,vishwakulkarni/cgeo,cgeo/cgeo,pstorch/cgeo,auricgoldfinger/cgeo,marco-dev/c-geo-opensource,pstorch/cgeo,Bananeweizen/cgeo,tobiasge/cgeo,SammysHP/cgeo,madankb/cgeo