Merge pull request #14788 from cmeh/patch-3

Correct "one invalid characters" to "one invalid character"

lib/private/files/view.php

@@ -1572,7 +1572,7 @@ class View {
 		} catch (ReservedWordException $ex) {
 			throw new InvalidPathException($l10n->t('File name is a reserved word'));
 		} catch (InvalidCharacterInPathException $ex) {
-			throw new InvalidPathException($l10n->t('File name contains at least one invalid characters'));
+			throw new InvalidPathException($l10n->t('File name contains at least one invalid character'));
 		}
 	}
 }