Fighting with non standard separator, dates and decimals are a big headache for data analysis studies.
Tableau may not understand separator or decimal symbol but you can describe it as below:
Defining separator at tableau:
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You need to change data Locale according to rules of country.
You can choose country as below:
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Then display problems should be solved.
Tableau may not understand separator or decimal symbol but you can describe it as below:
Defining separator at tableau:

You need to change data Locale according to rules of country.
You can choose country as below:

Then display problems should be solved.