"The file 'xxx' cannot be created" / "A file cannot be created"
They can be hardcoded in <a href="https://github.com/zotero/zotero/blob/3.1/chrome/content/zotero/xpcom/file.js#L494">file.js</a>: <code>str = str + " " + Zotero.getString('file.accessError.cannotBe') + " " + opWord + ".";</code>