Merge pull request #8 from BretonFin/master

Correction in main.en
admin menu in the middle of screen
Merge branch 'master' of github.com:michaelfranzl/SalorHospitality
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better tables/bookings switching
better tables/bookings switching
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Merge branch 'master' of github.com:michaelfranzl/SalorHospitality
added serialport gem
translation fix
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Closes bugs #1672 and #1673
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Feature #1675, #1674
disable more buttons during order send
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Feature #1685 Statistics feature: Count of sold articles/variants
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test
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