MozStumbler v0.7.5

• Updater failure fixes (@rodmoreno)
• Polish translation (@ireun)
• French translation (@tildedash)
• Hebrew translation (@yarons)
• German translations (@DaAllexx and @guerda)
• Refactored CellScanner in preparation for multiple SIM card support (@illarionov)
• Added more mobile SSIDs (@tomer)
• Simplified Chinese translation (@l-hedgehog)