Logging fixes

Logging fixes

fix #34 - No log files generated

• ensure logging path is created before log initialisation
• use consistent file numbering pattern AndrOBD.log.x.txt
• use .txt file extension to allow opening/viewing
• close file logging handler on app close
  • to eliminate stray lock files

Translation updates

• French (Thanks to @ll)
• Spanish (Thanks to @isalgueiro)
• Hebrew (Thanks to @yarons)
• German (Thanks to Andreas Kleinert)