Calc RC

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Basic calculations.
Add Czech language
Repair computing module
Added a database list of tires and list of motors
Add Slovak language
Fix errors by pressing the button back to list of tires and motors
Add German language
Added a database list of chargers
Views of linear dimensions in mm or inch
Added a database list of models
Add new models and tires
Added calculation of battery cells according to
Added a database list of servos
Added a new calculation module of wheel diameter and number of teeth