Double quotes don't work in some environments

https://getcomposer.org/doc/03-cli.md#require
Added Traditional Chinese translations
Removed Sphinx installation from foreign PPA
fixed erroneous line removal
Merge pull request #4422 from pmoust/sphinx

Removed Sphinx installation from foreign PPA
Merge pull request #4423 from whuhacker/master

Added Traditional Chinese translations
Merge pull request #4419 from arisk/patch-5

Removed double quotes
Simplified test environment setup
formatter: adds unit tests for base 1000, fixes #4412
fixes formatter doing one division too much, fixes #4427
Safer checks for apidoc renderer