Applying a left shift on a US QWERTY keyboard (each letter replaced by the key immediately to its left):
zyrnwys – if Welsh: "z" not native. Could be "syrnwys" → "syrn" (siren) + "wys" (men)? Or "z" = /s/ in some ciphers. danlwd fylm Bitter Moon ba zyrnwys farsy chsbydh bdwn sanswr
If the video you find doesn't already have the subtitles "hardcoded" (burned into the video), you can get them separately from reputable subtitle databases: Recommended Sites: Open Subtitles are top sources for Persian (Farsi) SRT files. Manual Method: Applying a left shift on a US QWERTY