Debug Backtrace does not give source of error

[Hackwar]

Steps to reproduce the issue

Create a PHP error in the backend, have debugging enabled.

Expected result

error.php of isis template displays error message with file and line number of the error and backtrace.

Actual result

file and line number are missing. The actual backtrace does not contain the file that actually created the error, but starts one file up.

System information (as much as possible)

Joomla 3.7.1, PHP 7.0

Additional comments

Something like this could be included in /administrator/templates/isis/error.php line 227.

						<?php if ($this->debug) : ?>
							<?php echo htmlspecialchars(' on line ' . $this->error->getLine() . ' in ' . $this->error->getFile(), ENT_QUOTES, 'UTF-8');?>
						<?php endif; ?>

However, the code above is not really translated or anything and I'm unsure what the right solution would be in terms of translated error messages?

[mbabker]

See #11675