Not sure how a multilingual world is related with the setting and units systems of TurboFloorPlan.
Let's clarify some concepts:
1 - The English system is not related with the English language => it is related with the measuring system used in US (for example). Centimeters are related with the Metric System used in Canada, South America, etc.
2 - In TurboFloorPlan you can determine the settings, units and precision using the desired system => Go to Design => Options => Units of Measure => Select the desired Unit, precision, decimal or fraction. Then go to => Design => Options => Dimensioning and fonts => check / uncheck display unit indicators.
3 - Note that if you select (for example) English System => Ft-in and you draw a custom wall with length= 200", the program will follow your instructions and the dimension will be expressed in FT-in, this means that instead of 200", the program will write 16'-8"
TFP, as any program, has a learning curve. The best way to learn the program, IMO, is practice + practice + practice => Read and follow the manual (this is important), see the videos => try to create elements not related with your project, so you will become familiar with the commands and how to develop the different components.
If you are interested, I have several training e-books, one of them is free. See links below.
Hope this helps.