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'tiff_bad_file' => 'The uploaded file contains errors: $1',

$1 is not substituted

Line 62 of PagedTiffHandler_body.php
if ( !$tr->isValidTiff() ) {
				wfDebug( __METHOD__ . ": bad file\n" );
				$status->fatal( 'tiff_bad_file' );
			}

^ No error parameter passed

Line 102

$error = array( 'tiff_bad_file', PagedTiffHandler::joinMessages( $errors ) );

^ should be ok..

Line 312

return $this->doThumbError( $params, 'tiff_bad_file' );