Filtering slicer based on containing words

I have two columns in PowerBI: "Language" and "LanguageSkills". Column "Language" is in table "Languages". The whole "Languages" table is made from only one column named "Language" with only 4 rows: {"German", "Italian", "French", "Spanish Language"}. Column "LanguageSkills" appears in table "Skills" and presents data connected to different people presenting their language skills. Here are example four rows from the column "LanguageSkills": {"German", "German, Italian", "German, Spanish, French", "Spanish"}. There is created the relationship between "LanguageSkills" and "Language" as many to one. Furthermore, I have a Slicer which I can use by selecting fields from "Language" and filtering with it "LanguageSkills" in my dashboard.

The case is, that for now when I for instance choose on Slicer "German" the data displayed in "LanguageSkills" column on my dashboard shows only exact values like "German". I need to make it possible to display every data where the word chosen on Slicer appears. So when I choose "German", apart from "German", I want to display data where the word "German" appears like "Italian, Spanish Language, German", "German, French" etc.

How to do that?