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Google translation: "Presets not visible but already imported. Hello friends, When I import a preset or other, a window appears and writes "parameter already imported" but impossible to see the trace. I followed the tutorials, but nothing to do, Could you help me?"
1. The preset may have been imported into a preset group that's currently hidden. In the Presets panel, click the + button and then Manage Presets:
Unhide all the preset groups and then look in each one in the Presets panel.
2. The .xmp file may be a creative profile rather than a develop preset. In the Basic panel, click the Profile menu and then Browse:
In the profile browser, click the + button and then Manage Profiles:
Unhide all the profile groups and then look in each one in the profile browser.
3. The preset may reference a creative profile that hasn't been imported into LR. The easiest way to check that is to attach the .xmp file to your reply here, and we'll take a look.