Gallery2: CS translation

- added 20Mpx resolution
- fixed decimal separator (Czech did not use dot)
- added 18 and 8.2 Mpx resolutions

Change-Id: I1a1e702e447875a4ca4fd7e311d5975492e1de99
Merge "Gallery2: CS translation" into cm-10.2
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2