kwin_scripting - en to it translation catalogue (3 entries)

[ctx: Error message]
en: Could not locate package metadata
it: Impossibile individuare i metadati del pacchetto

[ctx: Required file does not exist]
en: %1 does not contain a valid metadata.json file
it: %1 non contiene un file metadata.json valido

[ctx: Required file does not exist]
en: %1 does not exist
it: %1 non esiste
