[2143] Replace Path with String in library loading configuration

[frouene]

Bug: #2143

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[frouene]

I'm not sure if we need to add an entry to the user manual, it doesn't seem like a change that would affect end users.

[AxelRICHARD]

I'm not sure if we need to add an entry to the user manual, it doesn't seem like a change that would affect end users.

No we don't need to add an entry to the user manual.