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It looks like the phrase you provided is a mix of and Welsh .
If you see a website offering "1.19.51," it is likely an outdated build. The current versions are far ahead (1.20+). The Welsh word "mjana" (likely a typo for am ddim – free) and "Llandrwyd" (a locality) suggest someone is looking for a region-locked free copy.
You may have seen a search term floating around Welsh gaming forums recently: "thmyl mayn kraft akhr asdar 1.19.51 mjana llandrwyd" – a messy but identifiable request for the latest Minecraft version (1.19.51) free of charge, specifically for the Llandrwyd area.