Update (ru) translations with backup functionnality.

po formatting updates with sh po-update.sh script
Update README.md

added Russian Translator.
Update Changelog for future 0.20 release

update Russian Translation.
Update (es) translations with backup functionnality.

po formatting updates with sh po-update.sh script
Update Changelog for future 0.20 release

update Spanish translation.
Update isodumper.spec Update for future 0.20 release

drop DESTDIR="%{buildroot}" macros
Update (it) translations with backup functionnality.

po formatting updates with sh po-update.sh script
Update Changelog for future 0.20 release

update Italian translation.
Modifications to have authentication with polkit
- new bin/isodumper
- new polkit policy file
Simplify the command, as dd is no more used
Update po files with new strings from polkit policy
Update po files and po-update.sh to add isodumper.desktop title and comment
Updated with .destop entries
New: File to obtain translations of polkit file
Modifications to have authentication with polkit

-use mageia polkit policy instead of usermode.
-drop usermode-consoleonly package.
-update Makefile.
-update spec file.
-update Readme file.
-update Changelog file.