Translation debug improve error reporting

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12252
| License       | MIT
| Doc PR        |

Indicate which file was being parsed if an exception is thrown while running translation:debug

When running the translation:debug command, if a template contains invalid twig markup,
an exception is thrown. This patch rethrows a new exception that includes the filename
being parsed in the message to aid debugging.

@fabpot could it be that you forgot to commit the Fixtures directory here? Tests are failing with:

```
1) Symfony\Bridge\Twig\Tests\Translation\TwigExtractorTest::testExtractSyntaxError
Failed asserting that exception of type "InvalidArgumentException" matches expected exception "\Twig_Error". Message was: "The "/Users/jzalas/Projects/symfony/src/Symfony/Bridge/Twig/Tests/Translation/../Fixtures" directory does not exist." at
#0 /Users/jzalas/Projects/symfony/src/Symfony/Bridge/Twig/Translation/TwigExtractor.php(59): Symfony\Component\Finder\Finder->in('/Users/jzalas/P...')
#1 /Users/jzalas/Projects/symfony/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php(92): Symfony\Bridge\Twig\Translation\TwigExtractor->extract('/Users/jzalas/P...', Object(Symfony\Component\Translation\MessageCatalogue))
#2 [internal function]: Symfony\Bridge\Twig\Tests\Translation\TwigExtractorTest->testExtractSyntaxError()
#3 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/Framework/TestCase.php(952): ReflectionMethod->invokeArgs(Object(Symfony\Bridge\Twig\Tests\Translation\TwigExtractorTest), Array)
#4 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/Framework/TestCase.php(818): PHPUnit_Framework_TestCase->runTest()
#5 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/Framework/TestResult.php(686): PHPUnit_Framework_TestCase->runBare()
#6 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/Framework/TestCase.php(754): PHPUnit_Framework_TestResult->run(Object(Symfony\Bridge\Twig\Tests\Translation\TwigExtractorTest))
#7 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/Framework/TestSuite.php(675): PHPUnit_Framework_TestCase->run(Object(PHPUnit_Framework_TestResult))
#8 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/TextUI/TestRunner.php(425): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult))
#9 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/TextUI/Command.php(179): PHPUnit_TextUI_TestRunner->doRun(Object(PHPUnit_Framework_TestSuite), Array)
#10 /Users/jzalas/.composer/vendor/phpunit/phpunit/src/TextUI/Command.php(132): PHPUnit_TextUI_Command->run(Array, true)
#11 /Users/jzalas/.composer/vendor/phpunit/phpunit/phpunit(55): PHPUnit_TextUI_Command::main()
#12 {main}.
```